Question 1

The figure shows a graph of the position x of two cars,C and D,as a function of time t. 
According to this graph,which statements about these cars must be true? (There could be more than one correct choice. )

Accepted Answer

A)  The magnitude of the acceleration of car C is greater than the magnitude of the acceleration of car D.
B)  The magnitude of the acceleration of car C is less than the magnitude of the acceleration of car D.
C)  At time t = 10 s,both cars have the same velocity.
D)  Both cars have the same acceleration.
E)  The cars meet at time t = 10 s.F) A) and D)
G) A) and C)

Question 2

Two objects are dropped from a bridge,an interval of 1.0 s apart.Air resistance is negligible.During the time that both objects continue to fall,their separation

Accepted Answer

A)  increases.
B)  decreases.
C)  stays constant.
D)  increases at first,but then stays constant.
E)  decreases at first,but then stays constant.F) B) and C)
G) All of the above

Question 3

If the acceleration of an object is zero,then that object cannot be moving.

Accepted Answer

A) True 
 B)False

Question 4

A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 1.5 m/s2 and there is no atmosphere.How long does it take for the laser to reach the maximum height?

Accepted Answer

A)  8.0 s
B)  11 s
C)  14 s
D)  16 sE) A) and B)
F) A) and C)

Question 5

A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s2 to the right.What is the cart's displacement during the first 6.0 s of this motion?

Accepted Answer

A)  10 m
B)  55 m
C)  66 m
D)  80 mE) All of the above
F) C) and D)

Question 6

Which of the following quantities has units of a displacement? (There could be more than one correct choice. )

Accepted Answer

A)  32 ft/s2 vertically downward
B)  40 km southwest
C)  9.8 m/s2
D)  -120 m/s
E)  186,000 miF) B) and D)
G) None of the above

Question 7

If the position versus time graph of an object is a horizontal line,the object is

Accepted Answer

A)  moving with constant non-zero speed.
B)  moving with constant non-zero acceleration.
C)  at rest.
D)  moving with increasing speed.E) All of the above
F) A) and B)

Question 8

Two identical objects A and B fall from rest from different heights to the ground.If object B takes twice as long as object A to reach the ground,what is the ratio of the heights from which A and B fell? Neglect air resistance.

Accepted Answer

A)  hA/hB = 1/ A/hB = 1/   
B)  hA/hB = 1/2 
C)  hA/hB = 1/4 
D)  hA/hB = 1/8" class="answers-bank-image d-inline" rel="preload" >
B)  hA/hB = 1/2
C)  hA/hB = 1/4
D)  hA/hB = 1/8E) A) and B)
F) All of the above

Question 9

Abby throws a ball straight up and times it.She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s.What was the speed of the ball at launch? Neglect air resistance.

Accepted Answer

A)  11 m/s
B)  23 m/s
C)  34 m/s
D)  45 m/s
E)  48 m/sF) B) and C)
G) C) and D)

Question 10

Suppose a ball is thrown straight up and experiences no appreciable air resistance.What is its acceleration just before it reaches its highest point?

Accepted Answer

A)  zero
B)  slightly less than g
C)  exactly g
D)  slightly greater than gE) A) and B)
F) None of the above

Question 11

A baseball is hit with a bat and,as a result,its direction is completely reversed and its speed is doubled.If the actual contact with the bat lasts 0.45 s,what is the ratio of the magnitude of the average acceleration of the ball to its original speed?

Accepted Answer

A)  6.7 s-1
B)  4.4 s-1
C)  2.2 s-1
D)  0.15 s-1E) A) and B)
F) All of the above

Question 12

An object is thrown upwards with a speed of 13 m/s.How long does it take to reach a height of 4.0 m above the projection point while descending? Neglect air resistance.

Accepted Answer

A)  0.42 s
B)  1.2 s
C)  2.3 s
D)  3.1 s
E)  4.2 sF) B) and E)
G) All of the above

Question 13

A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2 and there is no atmosphere.What is the speed of the hammer after 8.0 s?

Accepted Answer

A)  7.0 m/s
B)  14 m/s
C)  21 m/s
D)  64 m/sE) A) and B)
F) A) and C)

Question 14

A bullet shot straight up returns to its starting point in 10 s.What is the initial speed of the bullet,assuming negligible air resistance?

Accepted Answer

A)  9.8 m/s
B)  25 m/s
C)  49 m/s
D)  98 m/sE) All of the above
F) A) and B)

Question 15

If you are driving 72 km/h along a straight road and you look to the side for 4.0 s,how far do you travel during this inattentive period?

Accepted Answer

A)  18 m
B)  20 m
C)  40 m
D)  80 mE) All of the above
F) A) and B)

Question 16

A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance.If the 10-kg rock falls with acceleration a,what is the acceleration of the 20-kg rock?

Accepted Answer

A)  4a
B)  2a
C)  a
D)  a/2
E)  a/4F) A) and B)
G) B) and E)

Question 17

A car is traveling with a constant speed of 30.0 m/s when the driver suddenly applies the brakes,causing the car to slow down with a constant acceleration.The car comes to a stop in a distance of 120 m.What was the acceleration of the car as it slowed down?

Accepted Answer

A)  3.75 m/s2
B)  4.00 m/s2
C)  4.25 m/s2
D)  4.50 m/s2
E)  4.75 m/s2F) A) and E)
G) None of the above

Question 18

Acceleration is sometimes expressed in multiples of g,where g= 9.8 m/s2. 
Is the acceleration of an object due to the earth's gravity.In a car crash,the car's forward velocity may go from 29 m/s.  To 0 m/s. 
In 0.15 s How many g's are experienced,on average,by the driver?

Accepted Answer

A)  20 g
B)  14 g
C)  24 g
D)  26 gE) A) and B)
F) A) and C)

Question 19

If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise) with the time axis,the object is

Accepted Answer

A)  moving with constant non-zero speed.
B)  moving with constant non-zero acceleration.
C)  at rest.
D)  moving with increasing acceleration.E) C) and D)
F) All of the above

Question 20

When is the average velocity of an object equal to the instantaneous velocity?

Accepted Answer

A)  only when the velocity is increasing at a constant rate
B)  only when the velocity is decreasing at a constant rate
C)  when the velocity is constant
D)  always
E)  neverF) None of the above
G) B) and C)

Exam 2: One-Dimensional Kinematics

The figure shows a graph of the position x of two cars,C and D,as a function of time t. According to this graph,which statements about these cars must be true? (There could be more than one correct choice. )

Correct AnswerverifiedShow Answer

Abby throws a ball straight up and times it.She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s.What was the speed of the ball at launch? Neglect air resistance.

Correct AnswerverifiedShow Answer

Acceleration is sometimes expressed in multiples of g,where g= 9.8 m/s2. Is the acceleration of an object due to the earth's gravity.In a car crash,the car's forward velocity may go from 29 m/s. To 0 m/s. In 0.15 s How many g's are experienced,on average,by the driver?

Correct AnswerverifiedShow Answer

A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s2 to the right.What is the cart's displacement during the first 6.0 s of this motion?

Correct AnswerverifiedShow Answer

If the position versus time graph of an object is a horizontal line,the object is

Correct AnswerverifiedShow Answer

A bullet shot straight up returns to its starting point in 10 s.What is the initial speed of the bullet,assuming negligible air resistance?

Correct AnswerverifiedShow Answer

An object is thrown upwards with a speed of 13 m/s.How long does it take to reach a height of 4.0 m above the projection point while descending? Neglect air resistance.

Correct AnswerverifiedShow Answer

Suppose a ball is thrown straight up and experiences no appreciable air resistance.What is its acceleration just before it reaches its highest point?

Correct AnswerverifiedShow Answer

A car is traveling with a constant speed of 30.0 m/s when the driver suddenly applies the brakes,causing the car to slow down with a constant acceleration.The car comes to a stop in a distance of 120 m.What was the acceleration of the car as it slowed down?

Correct AnswerverifiedShow Answer

Two objects are dropped from a bridge,an interval of 1.0 s apart.Air resistance is negligible.During the time that both objects continue to fall,their separation

Correct AnswerverifiedShow Answer

A baseball is hit with a bat and,as a result,its direction is completely reversed and its speed is doubled.If the actual contact with the bat lasts 0.45 s,what is the ratio of the magnitude of the average acceleration of the ball to its original speed?

Correct AnswerverifiedShow Answer

Two identical objects A and B fall from rest from different heights to the ground.If object B takes twice as long as object A to reach the ground,what is the ratio of the heights from which A and B fell? Neglect air resistance.

Correct AnswerverifiedShow Answer

If you are driving 72 km/h along a straight road and you look to the side for 4.0 s,how far do you travel during this inattentive period?

Correct AnswerverifiedShow Answer

When is the average velocity of an object equal to the instantaneous velocity?

Correct AnswerverifiedShow Answer

If the acceleration of an object is zero,then that object cannot be moving.

Correct AnswerverifiedShow Answer

If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise) with the time axis,the object is

Correct AnswerverifiedShow Answer

A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2 and there is no atmosphere.What is the speed of the hammer after 8.0 s?

Correct AnswerverifiedShow Answer

A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 1.5 m/s2 and there is no atmosphere.How long does it take for the laser to reach the maximum height?

Correct AnswerverifiedShow Answer

A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance.If the 10-kg rock falls with acceleration a,what is the acceleration of the 20-kg rock?

Correct AnswerverifiedShow Answer

Which of the following quantities has units of a displacement? (There could be more than one correct choice. )

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Acceleration is sometimes expressed in multiples of g,where g= 9.8 m/s². Is the acceleration of an object due to the earth's gravity.In a car crash,the car's forward velocity may go from 29 m/s. To 0 m/s. In 0.15 s How many g's are experienced,on average,by the driver?

Correct Answer
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A cart with an initial velocity of 5.0 m/s to the right experiences a constant acceleration of 2.0 m/s² to the right.What is the cart's displacement during the first 6.0 s of this motion?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s² and there is no atmosphere.What is the speed of the hammer after 8.0 s?

Correct Answer
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A laser is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 1.5 m/s² and there is no atmosphere.How long does it take for the laser to reach the maximum height?

Correct Answer
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Correct Answer
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Correct Answer
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