Which of the following is not true about Magnetic field Lines? 1 point Are always north to side outside magnet Are always south to north inside the magnet Are always north to south inside the magnet Has tangential direction at curves

The total mass of the protons and neutrons in a potassium-39 nucleus is 6.5307 x 10^-26 kilograms.

The mass of a potassium-39 nucleus can be calculated based on the total mass of its protons and neutrons. Potassium-39 is a stable isotope of potassium with 19 protons and 20 neutrons in its nucleus. The mass of a proton is approximately 1.6726 x 10^-27 kilograms, and the mass of a neutron is approximately 1.6749 x 10^-27 kilograms.

Therefore, the total mass of the protons in a potassium-39 nucleus is 19 x 1.6726 x 10^-27 = 3.18094 x 10^-26 kilograms. The total mass of the neutrons in a potassium-39 nucleus is 20 x 1.6749 x 10^-27 = 3.3498 x 10^-26 kilograms.

The total mass of the protons and neutrons in a potassium-39 nucleus is therefore 3.18094 x 10^-26 + 3.3498 x 10^-26 = 6.5307 x 10^-26 kilograms. This is the expected mass of a potassium-39 nucleus, based on the total mass of its protons and neutrons.

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The resistance of a conductor that carries a current of 120 amperes when the potential difference between its ends is 240 volts = 2 Ω

Electrical resistance is the force that opposes the flow of current, it's a component that can reduce the speed and quantity of the flow of electrons in an electric circuit.

The formula for electrical resistance can be seen to have several components, namely R is the resistance (Ω), V is the voltage (V), and I is the current strength (A).

The equation:

R = V/I

We have,

Current strength = 120 A

The potential difference between its ends  = 240 V

So, the resistance of a conductor that carries a current of 120 amperes when the potential difference between its ends is 240 volts:

R = 240 V / 120 A

= 2 Ω

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The intensity of sound in decibels at 10 m is 17.6 dB.

The intensity of sound in decibels at 100 m is 14.08 dB.

The formula to calculate intensity when power is given is I = P/A

where, I is the intensity

P is the power

A is the area

Given, P = 20 W

A₁ = 4πr² = 4π* 10² = 1256.64 m²

A₂ = 4πr² = 4π* 100² =125663.71 m²

I₁ = P / A₁ = 20/1256.64 = 0.0159 W/m²

I₂ = P / A₂ = 20/125663.71 = 0.000159 W/m²

The expression between intensity of sound and decibel level is

dB = 10* log (I/ 1.0* 10⁻¹² W/m²) --------(1)

Substituting the values of I₁ and I₂ in (1),

dB₁ = 10* log (1.5* 10⁻²/ 1.0* 10⁻¹²) =  10* log(1.5* 10¹⁰) = 10* [ log 1.5 + 10] = 10*(0.176* 10) = 17.6 dB

dB₂ = 10* log (1.5* 10⁻⁴/ 1.0* 10⁻¹²) = 10* log(1.5* 10⁸) = 10* [ log 1.5 + 8 ] = 10*(0.176* 8) = 14.08 dB

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In a case whereby the threads of a screw used to fasten two pieces of wood are pitched at an angle this will increase the static friction forceD By decreasing the coefficient of static friction between the screw and the wood.

It should be noted that the greater the thread angle, the greater the angle between the load vector  as well as the surface normal,  hence the  the normal force between the threads required to support a given load will be larger.

It should be nopted that the  here will be increase in  the thread angle  as well as the friction and wear of a screw.

Therefore, option D is correct.

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misssing options:

A By decreasing the surface area between the screw surface and the wood

B By increasing the ease of inserting the screw into the wood

C By increasing the normal force exerted by the wood on the screw thread

D By decreasing the coefficient of static friction between the screw and the wood

The fragments reaction is 7.59 MeV/nucleon and  8.39 MeV/nucleon

What is nucleus ?

Neutrons and protons, which have opposite electric charges, make up atomic nuclei. The strongest basic force now understood, known as the strong force, is what holds these things together. A normal atom's nucleus generally holds more than 99.9% of the atom's mass yet takes up considerably less than.01 percent of its volume.

What is fission ?

When a neutron collides with a bigger atom, it excites it and causes it to split into two smaller atoms, which are known as fission products. This process is known as fission. A chain reaction might start as a result of additional neutrons that are also emitted. Huge amounts of energy are produced during the splitting of each atom.

1) m_proton + m_netron + m_electron - m_U

= 92*1.007276466812 + 92*5.4857990943e-4 + 143*1.008664916 - (235.0439299)

= 1.9151 u

= 931.494061 * 1.9151 MeV

= 1784 MeV

= 1784/235 = 7.59 MeV/nucleon

2) m_proton + m_netron + m_electron - m_Cs

= 55*1.007276466812 + 55*5.4857990943e-4 + 82*1.008664916 - (136.9070895)

= 1.2338 u

= 931.494061 * 1.2338 MeV

= 1149 MeV

= 1145/137 = 8.39 MeV/nucleon

Therefore, the fragments reaction is 7.59 MeV/nucleon and  8.39 MeV/nucleon.

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Correct answer is b. at right angles to the direction of wave travel

The vibrations of a transverse wave move in a direction "at right angles to the direction of wave travel." The correct option is B.

A transverse wave is a type of wave where the particles of the medium vibrate perpendicular to the direction of wave propagation. In other words, the motion of the medium is at right angles to the direction in which the wave moves. The term "transverse" is derived from the Latin word "transversus", which means "across".

Examples of transverse waves include light waves, electromagnetic waves, and seismic S-waves. In a transverse wave, the displacement of particles in the medium is perpendicular to the direction of the wave. This type of wave can be described by its amplitude, wavelength, frequency, and speed.

The amplitude of a transverse wave is the maximum displacement of the particles from their equilibrium position. The wavelength is the distance between two successive points in the medium that are in phase with each other. The frequency is the number of waves that pass a given point in the medium per unit time. The speed of a transverse wave is determined by the properties of the medium, such as its density and elasticity.

One interesting property of transverse waves is that they can undergo polarization, which is the process of filtering out waves that vibrate in a certain direction. This is commonly used in polarized sunglasses to reduce glare from reflective surfaces.

Therefore, transverse waves are a type of wave where the particles of the medium vibrate perpendicular to the direction of wave propagation. They are characterized by their amplitude, wavelength, frequency, and speed, and can undergo polarization. Transverse waves have important applications in fields such as optics, communication, and seismology.

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If you replace a 100-watt  light bulb with a 25-watt compact fluorescent bulb, over a 10,000 hr life, you will save electricity bill of  $112,5

A fluorescent bulb is more energy efficient than an incandescent bulb. It produces the same amount of light with less electricity.

The energy used by the bulbs is often expressed in Kwh or kilowatt-hour.

The formula is:

Kilowatt-hours = power (in kilowatt) x time usage (in hours)

In the given problem:

Time usage = 10,000 hours

Light bulb:

Power = 100 watt = 0.1 kw

kwh = 0.1 x 10,000 = 1,000 kwh

electricity bill = 1000 kwh x $0.15/kwh = $150

fluorescent bulb

Power = 25 watt = 0.025 kw

kwh = 0.025 x 10,000 = 250 kwh

electricity bill = 250 kwh x $0.15/kwh = $37,5

Money save =  $150 - $37,5 = $112,5

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According to the question if the secondary coil of transformer has 500 turns, the secondary voltage is 1000 V.

Transformers for power, transformers for distribution, and transformers for isolation, in that sequence. We have Dual Winding Transformer and Autotransformers based on windings. We offer Core Type Transformers, Shell Type Transformers, and Berry Type Transformers based on core designs.

For an ideal transformer

Vs/Vp=Ns/Np

Given that primary voltage V =100 V

Number of turns in primary N = 50 turns

Number of turns in srcondary Ns = 500 turns

Therefore

Vs/100=500/50

Hence voltage across secondary Vs = 1000 V

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A graphical presentation that uses vertical bars to display the magnitude of quantitative data is known as a Column chart.

Column charts make use of vertical bars to compare several objects or categories. On one axis are the comparison categories, while on the other are the data values. They are helpful in illuminating the conditions at a specific time. Anything that can be counted, such the volume of items sold or website hits, can be represented in a column chart.

Using column charts, you may show how various numbers differ from one another. When there are significant differences in the data values, column charts—which are used to compare changes between groups over time—are easiest to understand.

If there are several categories to compare, a line graph could be easier to comprehend.

Column charts can be created using standard, stacked, or percentage forms. It is simpler to compare and identify trends in the data because the same data is presented in each format in a different way. The steps for creating conventional, stacked, and percentages charts are the same regardless of the outcome.

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As a result, the slope of the LM curve is 0.005.

The ratio of the income sensitivity of real money demand over the interest sensitivity of real money demand determines the slope of the LM curve, which is represented by the coefficient of Y, k over h. With regard to monetary policy, this ratio is crucial.

The money supply function has an impact on the LM curve as well. The supply of money may become more susceptible to interest rates in the current environment of high levels and volatility of interest rates.

The general LM equation is written in terms of Y and r,

Where Money supply = Money demand,

0.5Y – 100r = (M/P) where (M/P) is a constant

100r = 0.5Y - (M/P)

r = 0.005Y - 0.01(M/P)

dr/dY = 0.005 is the slope of the LM function.

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Mechanical weathering mechanisms include pressure release, thermal expansion, frost and root wedging. Weathering that occurs mechanically is sometimes called physical weathering.

This is typically referred to as thermal expansion. The fractional change in volume or length per unit change in temperature can be referred to as thermal expansion. Typically, the linear expansion coefficient is used when dealing with a solid expansion. The force perpendicular to an object's surface that is delivered per unit area over that force is known as pressure (symbol: p or P). The gauge pressure, also known as gauge pressure, is the pressure in relation to the surrounding air pressure. To express pressure, a variety of units are employed.

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The complete question is -

Thermal expansion, pressure release, and mineral, frost, and root wedging all are ________ weathering processes.

The weight of the car on the 12 degree slope is 546.72 lbs. This weight is important to know for various reasons, such as calculating the amount of force and energy required to move the car up the hill.

The weight of a car on a 12 degree slope can be calculated using the formula:

Weight = Force * sin(Slope Angle)

Therefore, the weight of the car on the 12 degree slope can be calculated as follows:

Weight = 650 lbs * sin(12°)

Weight = 546.72 lbs

The weight of a car on a 12 degree slope is important to know for various reasons. For example, if the car is being driven up the slope, it is important to know the weight of the vehicle to ensure that it will be able to make it up the hill. Additionally, knowing the weight of the car on the slope can help engineers and designers to calculate the amount of force and energy required to move the car up the hill.

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According to the question, two identical waves undergo pure constructive interference, resultant intensity is quadruple individual wave intensity.

When two or even more sound waves are present at once from distinct sources, they interact with one another to create a new wave. The combination of all previous waves results in the new wave. Interference is the term for wave interaction.

The reflecting light from an oil coating floating on water is one of the best illustrations of interference. Another illustration is the thin coating of a soap bubble (shown in Figure 1), which, when illuminated by either natural or synthetic light sources, reflects a variety of lovely colors.

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Whenever the ground is hit with enough force to crack or break, an earthquake results. Tectonic plate boundaries are linked to the majority of earthquakes.

An earthquake is a quick movement of geological materials beneath the earth's surface that causes the ground to shake violently or weakly. The tectonic plate boundary is where the earthquakes start.

The earthquake is the sudden energy released from the earth's crust that causes the earth's surface to shake. Seismic waves, also called S waves, are consequently produced. The type and severity of an earthquake are based on the local seismic activity.

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The Fraunhofer process is typically simpler to study even though they are physically the same processes and have distinct features. Fresnel diffraction, players who are near to one another, and non-parallel light rays

Participants in the Fraunhofer diffraction are far apart, and the light beams are parallel.

When plane waves are incident on a diffracting object and the diffraction pattern is observed far enough away from the object (a distance satisfying Fraunhofer condition) (in the far-field region), as well as when it is observed at the focal plane of an imaging lens, the Fraunhofer diffraction equation is used to model the diffraction of waves in optics. The Fresnel diffraction equation, on the other hand, predicts the diffraction pattern that is produced close to the diffracting object (in the near field area).

Although Joseph von Fraunhofer was not directly engaged in the formulation of the theory, the equation bears his name.

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0.00025 N is the magnitude of the net force on the first wire in (figure 1).

The total of all forces exerted on an item is known as the net force. A mass can accelerate due to net force. A body is subject to another force whether it is at rest or in motion. When there are a lot of forces acting on a system, the phrase "net force" is employed.

From the diagram, first wire has an attracting force from third wire at 0.04 m distance and a repelling force from second wire at 0.02 m distance.

Expression of the force is -

F = [µ ×π×(I)² × L] / (2πd)

When d = 0.02 m,

or, F = [4 ×π× 10⁻⁷(10)² × 0.50] / (2π × 0.02)

or, F = 0.0005 N

And when d = 0.04 m,

or, F = [4 ×π× 10⁻⁷(10)² × 0.50] / (2π × 0.04)

or, F =  0.00025 N

So, the net force on first wire  = 0.005 - 0.00025

= 0.00025 N repelling or upward.

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The complete question is as follows:

What is the magnitude of the net force on the first wire in (Figure 1)?

Express your answer in newtons.

The pilot should head 12.09 degrees clockwise to the west direction.

The actual velocity of plane over ground is calculated to be 410.34 km/hr.

This question can be solved using the concept of resolution of vectors.

Any vector that is oriented at an angle to the horizontal (or vertical) can be thought of as having two parts: the direction vector and the tangent vector, according to the definition of a vector (or components). In other words, any vector with a two-dimensional direction may be conceived of as having two pieces.

a) Let us assume that the plane moves at an angle θ (clockwise to the west direction).

Let the velocity of plane be given by '[tex]v_{a} \\[/tex]'. Now this velocity [tex]v_{a}[/tex] has two components.

According to the figure

[tex]v_{a}[/tex]sinθ= [tex]v_{w}[/tex]

here [tex]v_{a}= 420 km/hr[/tex]

[tex]v_{w}= 88 km/hr[/tex]

420 sinθ= 88

sinθ= [tex]\frac{88}{420}[/tex]= 0.209

which gives θ= 12.09 degrees

b) The actual velocity of the plane over ground is given by [tex]v_{a}[/tex]cosθ

v= 420cos(12.09)= 420×0.977=  410.34 km/hr

Complete question:

An airplane pilot wishes to fly due west. A wind of 88.0 km/h is blowing toward the south. A. If the airspeed of the plane (its speed in still air) is 420.0 km/h , in which direction should the pilot head?

B. What is the speed of the plane over the ground?

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They represent a simple explanation of our basic charge interactions, best recognized by the jingle "opposites attract, likes repel."

B and C are also untrue for the same reason; they contradict the fundamental statement of charge interactions. E and H are correct. To become charged, an object must either gain or lose electrons. Losing electrons causes more positive charge than negative charge, resulting in a positively charged item. Gaining electrons causes more negative charge than positive charge, resulting in a negatively charged item. Protons are securely linked in atom nuclei and can never be added or withdrawn by regular electrostatic means. The same argument leads to the rejection of options F and G as possible true.

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The reason the frog doesn't slip is the friction between his feet and the board

Friction is the force that opposes the relative motion between two surfaces that are in contact. In the case of a skateboard, the static friction between the feet and the board helps to keep someone from slipping off when the skateboard is not moving. Once the skateboard begins to move, the static friction changes to kinetic friction and helps to keep it from slipping off as the skateboard moves.

The amount of friction between two surfaces depends on the nature of the surfaces and the force with which they are pressed together. Thus, when the Freddy frog drops vertically and lands on a skateboard, the friction between his feet and the surface of the skateboard helps to keep him from slipping off.

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Answer: So the answer is (A) -1.11 m/s^2.

Explanation: To solve this problem, we need to use the formula for average acceleration, which is given by:

a = (vf - vi) / t

Where a is the acceleration, vf is the final velocity, vi is the initial velocity, and t is the time.

Plugging in the values given in the problem, we get:

a = (20 m/s - 120 m/s) / (1.5 minutes * 60 seconds/minute) = -100 m/s / 90 seconds = -1.11 m/s^2

So the answer is (A) -1.11 m/s^2.

The frictional force acting on the 13 kg mass is 40.65 N.

The acceleration of the block is calculated by applying the following kinematic equation as shown below.

s = ut + ¹/₂at²

where;

s = 0 + ¹/₂at²

¹/₂at² = s

at² = 2s

a = 2s / t²

a = (2 x 3.4) / (5.5²)

a = 0.225 m/s²

The frictional force acting on the 13 kg mass is calculated as follows;

W sinθ - F = ma

where;

(13 x 9.8 x sin20) - F = 13 x 0.225

43.57 - F = 2.925

F = 43.57 - 2.925

F = 40.65 N

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Answer: Fn = 450 N

Explanation:

Part of the tension acts in the upward y-direction, reducing the normal force.

ΣFy = Fn + Ftsin(30)-Fg

0 = Fn + (300 N)sin(30) - (60 kg)(10 m/s^2)

0 = Fn + 150 N - 600 N

0 = Fn - 450 N

Fn = 450 N

From Paris to Qatar for the world cup, two French riders traveled by bicycle. In three months, 7,000 kilometers overall.

The Fédération Internationale de Football Association (FIFA), the world's governing organization of association football, and its senior men's national teams compete in the FIFA World Cup, commonly referred to as the World Cup. With the exception of 1942 and 1946, when it was postponed due to World War II, the tournament has been conducted every four years since its inception in 1930. The current winners are France, who captured their second championship during the 2018 competition in Russia.

The structure uses a qualification round to choose the teams that advance to the tournament phase, which occurs over the previous three years. 32 teams fight for the title at sites in the host country or nations during the tournament round.

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Initial speed (vo) equals 12 m/s, and gravity (g) equals -9.8 m/s. When it lands, it will have a velocity of 2.

A particle or object's movement with the passage of time is expressed vectorially as velocity. The meter per second (m/s), usually referred to as speed, is the acknowledged unit of velocity magnitude.

According to the equation v = s/t, rate of change (v) is a dimensionless number that quantifies displacement (or a shift in position, s), over change in time (t).

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As you walk away from the charge, the potential becomes less negative and actually grows, coming closer and closer to zero.

If you are infinitely far away from the charge, the potential for both positive and negative charges is zero. The electric potential (also known as the electric field potential, potential drop, or electrostatic potential) is defined as the amount of work energy required to transport a unit of electric charge in an electric field from a reference point to a specified place. The Volt difference dropped across a fixed resistance of one ohm with a current of one ampere running through it is the unit of potential difference formed between two locations.

dV

​V=5x \s2 \s −10x−9

dx dV \s​ \s

=10x−10

so, E=−(10x−10)

The value of E=(1010)

=0V/m for

x=1m

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The maximum distance from mercury to the sun is 0.58 * 10⁸ km.

The minimum distance b/n them is 0.46 * 10⁸ km.

The shape of an elliptical orbit can be described by its eccentricity, which is a measure of how "flattened" the ellipse is. An eccentricity of 0 indicates a circular orbit, while an eccentricity of 1 indicates a parabolic orbit.

In the case of Mercury's orbit, the eccentricity is given as 0.206, which means that the orbit is slightly flattened, but still close to circular. The length of the major axis of the ellipse is given as 1.16 * 10⁸ km.

To find the maximum distance from Mercury to the sun (also known as the aphelion), we need to find the distance from the center of the ellipse to the farthest point on the ellipse (which is at the top of the major axis). This distance is equal to half of the length of the major axis. Thus, the maximum distance from Mercury to the sun is:

1.16 * 10⁸ km / 2 =0.58 * 10⁸ km

To find the minimum distance between Mercury and the sun (also known as the perihelion), we need to find the distance from the center of the ellipse to the closest point on the ellipse (which is at the bottom of the major axis). This distance is equal to half of the length of the major axis times the square root of 1 - (eccentricity)². Thus, the minimum distance between Mercury and the sun is:

[tex](1.16 x 10^8 km / 2) * \sqrt{(1 - (0.206)^2) } = 0.46 * 10^8 km[/tex]

Therefore, Note that the sun is located at one of the foci of the elliptical orbit, rather than at the center. However, since the eccentricity of Mercury's orbit is relatively small (0.206), the distance from the center of the ellipse to either focus is very close to the distance from the center to the top or bottom of the major axis, and the difference can be ignored for most purposes.

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The final RPM of ice skater is 116.38.

RPM's meaning?  per revolution

RPM, which stands for revolutions per minute, is a measure of how quickly a machine is operating at any one time. RPM is a measure used in automobiles to indicate how often the crankshaft completes one full rotation each minute as well as how frequently each piston rises and falls in its cylinder.

Briefing:

ω₀ = 6.2π rad/s

α= 10π rad/s

t = 4.2 s

Find: ω

ω = αt + ω₀

ω  = 10 (0.6 s) + 6.2π rad/s

ω =  116.38RPM

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The center of gravity of the man doing the classic yoga poses will be as shown in first figure.

The Center of Gravity is the theoretical point in the body where the body's total weight is expected to exert force. It is important to know the center of gravity because it predicts the behavior of a body's movement when obeying gravity. It is also used in the construction of static structures such as buildings and bridges.

In a modern gravitational field, the center of gravity is identical to the center of mass. However, the two concepts do not always coincide. For the moon, the center of mass is very close to its geometric center. However, its center of gravity is slightly lower than Earth's due to the strong gravitational force of the nearby moon.

In a symmetrically shaped object made of homogenous materials, the center of gravity will match the body's geometric location. However, an asymmetrical object consisting of many components with different dimensions will have its center of gravity at some distance from its geometric center. In the hollow body or irregularly shaped body, the center of gravity in a point outside the body material.

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The angular acceleration is 0.01533rad/s.

We are given that,

Radius = r = 27.0cm

Speed = v = 11.2 m/s

Time = t = 24.0 s

Therefore , We shall first find the linear acceleration before calculating the angular acceleration from one of the linear motion kinematics equations and the initial velocity u will be 0.

v = u + at

a = v/t

a = (11.2m/s)/(27.0×10⁻²m)

a = 0.414 ×10⁻²m/s²

Now , calculating the angular acceleration,

a = α × r

α = a/r

α =  (0.414 ×10⁻²m/s²)/(27.0×10⁻²m)

α = 0.01533rad/s

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If we assume at time instance t= 0, then the same thing happens. initial velocity is equal to final velocity

During a free fall, only the gravitational force acts on a body. The initial velocity of the body is zero during free fall.

Vertical motion is symmetrical - the distance and time are the same in the rise as in the fall; the final velocity will have the same magnitude as the initial velocity but in the opposite direction. Horizontal components will never be effected by gravity; it is constant velocity motion

The average velocity is the ratio of the total distance traveled to the total time taken. This can happen in two cases, first if the initial velocity and the final velocity are equal to the average velocity and there is no change in the velocity for the entire trip

Velocity is the measure of the amount of distance an object covers in a given amount of time. Here's a word equation that expresses the relationship between distance, velocity and time: Velocity equals distance travelled divided by the time it takes to get there.

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