A runner decreases his velocity from 20 m/s to 10 m/s in 2.0 s.
What was his average acceleration?

Answers

Answer 1
Acceleration = change in velocity/change in time

So you should have (20-10)/(0-2)= -10/2 = -5

So your answer is -5
Answer 2

We have that the average acceleration is

[tex]a=5m/s^2[/tex]

From the Question we are told that

Decreases his velocity from 20 m/s to 10 m/s in 2.0 s.\

Generally the equation for the average acceleration  is mathematically given as

[tex]a=\frac{u-v}{t}\\\\a=\frac{20-10}{2}[/tex]

[tex]a=5m/s^2[/tex]

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Related Questions

Please Help! Im dumb.

Two completely different compounds may contain identical elements.


True or False

Answers

the answers false I believe
The answer is false hopes this helps!

Position vs Time
20
15
10
B
5
C
position (m)
0
D
-5
-10
-15
E
20
0 1 2 3
8
9
10
11
12
4 5 6 7
time (sec)
401320

Answers

Answer:

20

15

10

B

5

C

position (m)

0

D

-5

-10

-15

E

20

0 1 2 3

8

9

10

11

12

4 5 6 7

time (sec)

Explanation:

okk

Which pair of quantities represent scalar quantities, and how are they different from vector quantities?

A. energy and velocity

B. displacement and velocity

C. displacement and time

D. distance and time

Answers

D.

They don't have directions.

The quantities with only magnitude and no direction are called scalar quantities. Therefore, option D is the correct answer.  

Scalar quantities have only magnitude but vector quantities have both magnitude and direction. Some examples of scalar quantities are,

• Mass

• Temperature  

• Speed

• Density

Thus, we conclude that the quantities with only magnitude and no direction are scalar quantities. Hence option D is the correct pair.

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An airplane is seller rates down a runway at 3.10 M/S squared 441.5 seconds from rest until finally left off the ground ,what is the displacement before takeoff

Answers

Answer:

302129m

Explanation:

Using s= ut + 1/2at²

But u= 0

So

S= 1/2(3.1)(441.5)²

=302129m

What indicates that an atom
has no overall charge?

Answers

When the amount of protons and electrons is the same within the atom. Hope this is the answer you’re looking for :)

whats the average velocity

Answers

Answer:

A velocity is a vector unit, and average velocity can be described as the displacement divided by the time. The units for velocity can be understood from the definition to be meters/second or in common any distance unit over any time unit. The average speed of a body is described as the distance covered divided by the time elapsed.

Explanation:

the force of speed

Answer:

10 m/s

Explanation:

The average velocity is the slope of the graph.

m = (10 - 0)/(1 - 0)

m = 10/1

m = 10 m/s

A Force of 20N displaces a body about 45m how much work is done?​

Answers

Answer:

159 ofc

Explanation:

159 is how much work is done to the body.

What do the planets have in common and how are they different?

Answers

They are all different sizes and distances from the sun, they all rotate around the sun

Answer:

They vary quite a lot, yet there are some similarities

Explanation:

With Mercury, you have a hot and barren expanse of rock

With Venus, you also have a fairly hot and barren expanse of rock, with a molten core

With Earth, you have a warm/cool variant with water and a full atmosphere

With Mars, you have a colder and barren expanse of valleys and rock, with a rather paste-like ground

With Jupiter, we have our first gas giant, covered in clouds with a thick atmosphere

With Saturn, it is yet another gas giant, with rings of gas and rock and a dense core of metals, such as iron and nickel

With Uranus, it is also rather gas-full with a fair amount of water and methane, which results in its bluish color (an ice giant)

And finally with Neptune, it is the other ice giant, consisting of water, methane, and ammonia

So there are some similarities (gases, water, land formations, etc.) and some differences (rings, temperature, structure, etc.). Our planets are very unique to one another and continue to engage and surprise us.

- The school zone in front of your school has a posted speed limit of 25 mi/h, which is about 11 m/s. Let's
examine the stopping of a car in several different situations.
a. The crossing guard holds up her stop sign, and the driver is paying attention well. The car moves at a
constant velocity of 11 m/s for 2.3 seconds while the driver reacts, then slows down at a constant rate
of -4.5 m/s2. What is the stopping distance for the car in this situation?​

Answers

Answer:

s = 38.7 m

Explanation:

First we calculate the distance covered during uniform motion of reaction time.

s₁ = vt

where,

s₁ = distance covered during uniform motion = ?

v = uniform speed = 11 m/s

t = time = 2.3 s

Therefore,

s₁ = (11 m/s)(2.3 s)

s₁ = 25.3 m

Now, we calculate the distance covered during decelerated motion:

2as₂ = Vf² - Vi²

where,

a = deceleration = -4.5 m/s²

s₂ = distance covered during decelerated motion = ?

Vf = Final Velocity = 0 m/s

Vi = Initial Velocity = 11 m/s

Therefore,

2(-4.5 m/s²)s₂ = (0 m/s)² - (11 m/s)²

s₂ = (-121 m²/s²)/(-9 m/s²)

s₂ = 13.4 m

the total distance will be:

s = s₁ + s₂

s = 25.3 m + 13.4 m

s = 38.7 m

a 50-kg object moving at 12 m / s has a momentum of 600 kg m / s what is the mass of an object moving at 4 m/s has the same momentum

Answers

Explanation:

p=mv

600kgms-1=m × 4ms-1

m=600kgms-1/4ms-1

m=150kg

The mass of the object which has momentum of 600kgm/s with the velocity of 4m/s is 150kg.

What is Momentum?

Momentum is the product of the mass and velocity of the object. Momentum is the quantity of motion which is made up of the amount of matter moved and the velocity at which it moves. Momentum is a vector quantity because it has both the magnitude and direction. The SI unit of momentum is kg.m/s (kilogram meter per second).

p = m × v

p = momentum of the object,

m = mass of the object,

v = velocity of the object

600kgm/s = m × 4m/s

m = 600/ 4

m = 150kg

Therefore, the mass of the object will be 150kg.

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In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon over the mouth of the flask. Bubbles formed in the solution and the balloon inflated.
What most likely occurred during this demonstration?
:The Zn and HCl both retained their identity.
:Either Zn or HCl, but not both, retained its identity.
:Evaporation of one of the substances occurred.
:One or more new substances formed.

Answers

Answer:

d

Explanation:

When a teacher mixed zinc (Zn) with hydrogen chloride (HCl), one or more new substances formed. Hence, option (d) is correct.

What is chemical reaction?

A chemical reaction is a procedure that causes one group of chemical components to change chemically into another.

Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present).

The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.

When the teacher mixed zinc (Zn) with hydrogen chloride (HCl), chemical reaction happens and more than one new substances formed.

2Zn + 2HCl → 2ZnCl + H₂

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What does the acronym B.E.E.F. stand for?

Question 5 options:

box-out, elbows out, energize, follow-through


balance, engage, eyes, field goal


block, engage, eyes, free-throw


balance, eyes, elbow in, follow-through


The defense is the team that has possession of the basketball, and is trying to score points.

Question 6 options:
True
False
Question 7 (5 points)
The bounciness of a basketball is most important for which action?

Question 7 options:

Shooting


Passing


Dribbling


Stealing

Question 8 (5 points)
What can you infer about why certain shots are worth three points, and others are only worth two?

Question 8 options:

Three-point shots are taken from longer distances, so they're harder to make


Three-point shots reward players for not committing fouls when they shoot


Three-point shots require shooters to battle through more defensive pressure than two-point shots


Three-point shots can only be taken by guards, while two-point shots can be taken by any player

Question 9 (5 points)
How are free throws different from ordinary shots?

Question 9 options:

They only occur late in games


They're taken by defensive players, not offensive players


They cannot be rebounded


They're each worth one point instead of two or three

Question 10 (5 points)
A player with the basketball has to dribble the ball to be able to move around.

Question 10 options:
True
False
Question 11 (5 points)
All shots in basketball are worth two points.

Question 11 options:
True
False
Question 12 (5 points)
Which skill is least useful on defense?

Question 12 options:

Speed


Strength


Passing Ability


Jumping Ability

Question 13 (5 points)
Who is the inventor of basketball?

Question 13 options:

James Naismith


John Bradshaw


Jerry West


Joe Namath

Question 14 (5 points)
What conclusion can be drawn from the fact that many of the best international players want to play in the NBA?

Question 14 options:

It's easier to join NBA teams than teams in other countries


Many of these players have never been to the United States


Basketball isn't very popular outside the United States


The NBA is the most competitive league in the world

Question 15 (5 points)
Which action is taken only by teams on offense?

Question 15 options:

Rebounding


Blocking


Stealing


Shooting

Question 16 (5 points)
A free-throw is a one point shot from the foul line.

Question 16 options:
True
False
Question 17 (5 points)
Finger-pads, waist level, and eyes up are cues for what skill?

Question 17 options:

Shooting


Stealing


Dribbling


Passing

Question 18 (5 points)
A person should step toward their target when passing the basketball.

Question 18 options:
True
False
Question 19 (5 points)
Any illegal physical contact to a basketball player is a foul.

Question 19 options:
True
False
Question 20 (5 points)
It is important to keep the _________ in when shooting the basketball.

Question 20 options:

Ankle


Foot


Knee


Elbow

Answers

Answer:

balance, eyes, elbow in, follow-through

Explanation:

When velocity is positive and acceleration is negative, what happens to the object’s motion?
a The object speeds up.
b The object remains at rest.
c Nothing happens to the object.
d The object slows down.

Answers

Answer:

Option (D) : The object slows down.

Solve.

(3.0 × 107)x (1.5 × 103)

Answers

Answer:49594.5

Explanation:

321x(1.5x103)
321x154.5
Answer-49594.5
(I included the steps in case you needed them)

A train travelled 500 meters in 25 seconds

Answers

[tex]\huge\mathfrak\red {Answer:}[/tex]

Speed = Distance/Time

If a train travelled 500 meters in 25 seconds then,

Speed = 500m/25sec

20 m/sec

[tex]\mathfrak\purple {Hope\: this\: helps\: you...}[/tex]

speed=500m/25sec

20m/sec

Which of these objects could be falling with constant acceleration?

Answers

Answer:

1 and 2

Explanation:

If an object has constant acceleration, it's displacement at time t is:

Δx = v₀ t + ½ at²

For object 1:

0.44 = (0) (0.3) + ½ a (0.3)²

a = 9.78

3.14 = (0) (0.8) + ½ a (0.8)²

a = 9.81

So object 1's acceleration is approximately constant.

For object 2:

0.06 = (0) (0.3) + ½ a (0.3)²

a = 1.33

3.09 = (0) (2.1) + ½ a (2.1)²

a = 1.40

So object 2's acceleration is approximately constant.

For object 3:

0.44 = (0) (0.3) + ½ a (0.3)²

a = 9.78

3.09 = (0) (2.1) + ½ a (2.1)²

a = 1.40

So object 3's acceleration is not constant.

6.P.2.1 Matter: Properties and Changes Notes

The Theory ______

of Conservation

of

states:______

cannot be

or!____________

height

is anything that has

(weight) and height

(takes up space).

A

is the

in an object.

is the

an object takes

to add speaker notes

Answers

Answer:

The __law__ conservation

of state that either energy may produced nor destroyed

A car accelerates from rest at 7.2 m/s 2 . How much time does it need to attain a speed of 4 m/s? Answer in units of s.

Answers

Answer:

The time is 0.6 sec.

Explanation:

Given that,

Acceleration of car = 7.2 m/s²

Speed = 4 m/s

We need to calculate the time

Using equation of motion

[tex]v=u+at[/tex]

Where, u = initial velocity

v = final velocity

a = acceleration

t = time

Put the value in the equation

[tex]4=0+7.2\times t[/tex]

[tex]t=\dfrac{4}{7.2}[/tex]

[tex]t=0.6\ sec[/tex]

Hence, The time is 0.6 sec.

human activities can have positive and negative effects on the environment. Humans can benefit natural areas by
A. throwing waste products in these areas.
B. removing all the vegetation from theses areas.
C. polluting the areas by burning fossil fuels.
D. preserving the natural resources that they provide.​

Answers

the answer would be D , the rest are ways humans basically destroy nature

_________________ are labels for ranges of weight that are greater than what is generally considered healthy for a given height.
A. Overweight and obesity
B. Overweight and morbidity
C. Obesity and diabetes
D. Obesity and heft

Answers

Answer: A. Overweight and obesity

Explanation:

Overweight and obesity are labeled for ranges of weight that are greater than what is generally considered healthy for a given height. Hence, option A is correct.

What are Overweight and obesity?

Overweight and obesity are calculated by Body Mass Index (BMI). BMI is a person's weight in kilograms divided by the square of height in meters. The healthy adult human BMI ranges from 18.5 to 25.

If BMI is less than 18.5, it falls within the underweight range. If the BMI ranges from 25.0 to 29.9, it falls within the overweight range. If the BMI is greater than 30, it comes under the obesity range. A high BMI indicates high fatness.

Obesity and overweight are determined as an abnormal growth or excessive fat accumulation in the healthy range. It is caused by an energy imbalance between calories consumed and calories expended.

Obesity and Being overweight can cause certain diseases and health issues. It increases the risk of high blood pressure, heart disease, diabetes, and stroke.

It is important to maintain a healthy range BMI. Obesity and overweight are reduced by making the choice of healthier foods and regular physical activities like yoga and exercise.

Hence, The correct option is A) Overweight and Obesity.

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convert 288cm to Meters

Give explanation + formula

Answers

Answer:

288 cm is 2.88 meters. This is because each centimeter is 1/100th of a meter, or in other words, each meter is 100 cm. To find out cm-m, divide the amount of cm by 100 and change the unit to m.

Explanation:

formula is cm/100=m

288/100= 2.88m

If size of an image is 10 cm and the magnification produced by a mirror is +1, what will be the size of object?

Answers

Answer:

h = 10 cm

Explanation:

The magnification produced by a mirror is given by :

[tex]m=\dfrac{h'}{h}[/tex]

h' is the image size and h is the object size

We have, h = 10 cm, m = +1

So,

[tex]m=\dfrac{h'}{h}\\\\h=\dfrac{10}{1}\\\\h=10\ cm[/tex]

So, the size off the object is same as that of the size of the image i.e. 10 cm.

Why does a green leaf look green in our eyes

Answers

They look green because of the “special pair” of chlorophyll molecules.

Answer:

because the leaf absorbs all the other colors except for green. So the leaf reflects the green color which is what we see. that is why a leaf spears to be green.

Explanation:

floor gang aooh sub to pewdiepie

explain at least two differences between justice system laws and scientific laws.

Answers

The adversarial system is rigid – the roles are proscribed – the prosecutor wants to convict, the defendant wants a decision of not guilty. They are not just allowed but expected to bias their presentation, trusting the truth to come out between the adversaries. Science certainly has its sides of partisanship and bias. But these sides are self-imposed and can be abandoned at any time. While a prosecutor should not lie or hide evidence, and should drop a case if they become convinced the defendant is innocent, they wake up in the morning with no choice about which side of the argument they will come down on. In the criminal justice system the advocates are rigidly fixed in their roles and the jurors are rigidly neutral (the process to find a random neutral jury took as long as the trial itself). In science, the advocates are the same people as the jurors. And as a result they have to be willing to be flexible and change their minds. A good scientist shouldn’t have a pre-determined rigid answer to a question.
Lack of investigation – we jurors were told over and over not to investigate the situation ourselves. We were to make our decision only on the basis of the evidence presented to us. I can tell you in the case I was on there were at least two whopping big questions hanging over the case that nearly every juror in the room identified as very important but not addressed by either lawyer. Either one of them (whether the defendant’s schedule allowed time to drink before being stopped in the car, whether a particular medical condition could affect breathalyzer tests) could have changed the outcome. We could have answered one of these with 10 minutes on google and the other with some very simple subpoena of records. But we couldn’t use any of this. Scientists obviously are the opposite – if they need more information, they are expected to go get it before making an opinion.
Reliance on personal testimony – although science and trials share a focus on evidence, trials recognize testimony of individual people under oath as a major form of evidence. They certainly acknowledge the possibility of lying and explicitly instruct jurors to decide what testimony they believe. My case was unusual in that there was so much video footage, but still a majority of the case came down to testimony by the police officers, and most cases even a few years ago would have had only testimony. Science on the other hand, doesn’t accept testimony. Or does it? What else is the methods and results section of a paper? I’m on the fence whether science is so different on this one.

Starting from rest, a truck accelerated at a rate of 2 m/s to the right for 25 seconds. How far will the truck travel during this time period

Answers

Answer:

S= ?

V=2m/sec

t=25s

S=V*t

S=2*25

S=50m

How can the force of friction between two surfaces be reduced?
a. By changing rolling friction to sliding friction.
b. By making smooth surfaces rougher.
c. By separating surfaces with a lubricant.
d By increasing the force between the surfaces.

Answers

B if you make it rougher they won’t be able to have frictions
C because it will reduce the friction and help the object work together

Multiple Choice
Which of the following was not required by the Massachusetts Education Law of 1642?
O
Children were to be educated in basic religious principles and the laws of the commonwealth.
O Children were to be able to read and write.
O Children of servants were included in the law as recipients of said education.
Children were to be sent to designated schoolmasters for their learning.

Answers

Answer:

What was not required by the Massachusetts Education law of 1642 is;

Children were to be sent to designated schoolmaster for their learning

Explanation:

The Law of 1642 required that parents and master see to it that their children knew the principles of religion and the capital laws of the commonwealth.

The important aspects of the 1642 Law includes;

1) The responsibility for the basic education and literacy of a child are those of the parents and masters of child apprentices

2) Reading and writing competency of all children and servants are a requirement

3) It is the duty of the government, where a parent or master are unable to meet their tutoring responsibility, to see that a child is placed where the basic educational requirement will be met.

The role of a schoolmaster or the setting of a formal school were yet to be formed as at that time.

Answer:

The correct answer is Children were to be sent to designated schoolmasters for their learning

The responsibility of educating children was on parents and apprenticeship masters, not on designated teachers or schoolmasters. However, the law did allow the government to step in if the supervising adults failed in their responsibilities.

Explanation:

What's the answer to this question?​

Answers

Answer:

The barometer is supporting 75 cm of Hg due to atmospheric pressure.

Since the manometer is open to air pressure, the gas pressure is supporting the air pressure plus the 30 cm of Hg.

So the "absolute" gas pressure is 75 + 30 = 105 cm of Hg.

A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.
A - what is the zero error of the micrometer?
B - what is the correct diameter wire?

Answers

The answer should be b

A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.

What is micrometer?

The micrometer is an instrument that is capable of measuring the component of an object to very high precision. It is used to obtain accurate measurements in engineering.

In the case of the copper wire, the diameter of 0.3 mm was an approximation and a more accurate measure of the diameter would be obtained by using the micrometer.A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.

Therefore, A micrometer is used to measure the diameter of a length of copper wire. The zero error and scale reading are as shown.The correct answer should be the micrometer.

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The graph shows the motion of a lift starting at rest and initially moving upwards: What is the acceleration of the lift between 0 and A?

Answers

Answer:

0.67 m/s²

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 0 m/s

Final velocity (v) = 2 m/s

Time (t) = 3 secs

Acceleration (a) =?

Acceleration can be defined as the rate of change of velocity with time. It can be represented mathematically as:

Acceleration = change in velocity /time.

a = (v – u) /t

With the above formula, we can calculate the acceleration of the lift as shown below:

Initial velocity (u) = 0 m/s

Final velocity (v) = 2 m/s

Time (t) = 3 secs

Acceleration (a) =?

a = (v – u) /t

a = (2 – 0) /3

a = 2/3

a = 0.67 m/s²

Thus, the acceleration of the lift between 0 and A is 0.67 m/s².

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