Question 1

A car travels at 15 m/s for 10 s.It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s.At the end of this time,what is its velocity?

Accepted Answer

A) 15 m/s 
B) 30 m/s 
C) 45 m/s 
D) 375 m/s 
A) 15 m/s 
B) 30 m/s 
C) 45 m/s 
D) 375 m/s

Question 2

Which of the following situations is impossible?

Accepted Answer

A) An object has velocity directed east and acceleration directed west. 
B) An object has velocity directed east and acceleration directed east. 
C) An object has zero velocity but non-zero acceleration. 
D) An object has constant non-zero acceleration and changing velocity. 
E) An object has constant non-zero velocity and changing acceleration. 
A) An object has velocity directed east and acceleration directed west. 
B) An object has velocity directed east and acceleration directed east. 
C) An object has zero velocity but non-zero acceleration. 
D) An object has constant non-zero acceleration and changing velocity. 
E) An object has constant non-zero velocity and changing acceleration.

Question 3

A toy rocket is launched vertically from ground level at time t = 0.00 s.The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 81 m and acquired an upward velocity of 40 m/s.  The rocket continues to rise with insignificant air resistance in unpowered flight,reaches maximum height,and falls back to the ground.The upward acceleration of the rocket during the burn phase is closest to

Accepted Answer

A) 9.9 m/   . 
B) 9.6 m/   . 
C) 9.3 m/   . 
D) 9.0 m/   . 
E) 8.7 m/   . 
A) 9.9 m/   . 
B) 9.6 m/   . 
C) 9.3 m/   . 
D) 9.0 m/   . 
E) 8.7 m/   .

Question 4

Two cars are traveling at the same speed and hit the brakes at the same time.Car A decelerates (decreases its velocity)at twice the rate of car B.If car A travels a distance D before stopping,how far does car B travel before stopping?

Accepted Answer

A) 4D 
B) 2D 
C) D 
D) D/2 
E) D/4 
A) 4D 
B) 2D 
C) D 
D) D/2 
E) D/4

Question 5

An object is moving with constant non-zero velocity in the +x direction.The position versus time graph of this object is

Accepted Answer

A) a horizontal straight line. 
B) a vertical straight line. 
C) a straight line making an angle with the time axis. 
D) a parabolic curve. 
A) a horizontal straight line. 
B) a vertical straight line. 
C) a straight line making an angle with the time axis. 
D) a parabolic curve.

Question 6

In the absence of air resistance,a ball is thrown vertically upward with initial speed v.An identical ball is thrown upward with initial speed 2v.If the first ball reaches a maximum height h,what maximum height will the second ball reach?

Accepted Answer

A) 8h 
B) 4h 
C) 2h 
D)    h 
E) h 
A) 8h 
B) 4h 
C) 2h 
D)    h 
E) h

Question 7

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance.If it takes the 20-kg rock a time T to reach the ground,what time will it take the 10-kg rock to reach the ground?

Accepted Answer

A) 4T 
B) 2T 
C) T 
D) T/2 
E) T/4 
A) 4T 
B) 2T 
C) T 
D) T/2 
E) T/4

Question 8

An object is moving with constant non-zero acceleration in the +x direction.The velocity versus time graph of this object is

Accepted Answer

A) a horizontal straight line. 
B) a vertical straight line. 
C) a straight line making an angle with the time axis. 
D) a parabolic curve. 
A) a horizontal straight line. 
B) a vertical straight line. 
C) a straight line making an angle with the time axis. 
D) a parabolic curve.

Question 9

An object moves 15.0 m north and then 11.0 m south.Find both the distance it has traveled and the magnitude of its displacement.

Accepted Answer

A) 4.0 m,26.0 m 
B) 26.0 m,4.0 m 
C) 26.0 m,26.0 m 
D) 4.0 m,4.0 m 
A) 4.0 m,26.0 m 
B) 26.0 m,4.0 m 
C) 26.0 m,26.0 m 
D) 4.0 m,4.0 m

Question 10

A car accelerates from 5.0m/s To 21 m/s At a constant rate of 3.0 m/s2. 
How far does it travel while accelerating?

Accepted Answer

A) 69 m 
B) 207 m 
C) 41 m 
D) 117 m 
A) 69 m 
B) 207 m 
C) 41 m 
D) 117 m

Question 11

An object is moving with constant non-zero acceleration in the +x direction.The position versus time graph of this object is

Accepted Answer

A) a horizontal straight line. 
B) a vertical straight line. 
C) a straight line making an angle with the time axis. 
D) a parabolic curve. 
A) a horizontal straight line. 
B) a vertical straight line. 
C) a straight line making an angle with the time axis. 
D) a parabolic curve.

Question 12

Suppose that a car traveling to the east (+x direction)begins to slow down as it approaches a traffic light.Which statement concerning its acceleration must be correct?

Accepted Answer

A) Its acceleration is in the +x direction. 
B) Its acceleration is in the -x direction. 
C) Its acceleration is zero. 
D) Its acceleration is decreasing in magnitude as the car slows down. 
A) Its acceleration is in the +x direction. 
B) Its acceleration is in the -x direction. 
C) Its acceleration is zero. 
D) Its acceleration is decreasing in magnitude as the car slows down.

Question 13

An astronaut stands by the rim of a crater on the Moon,where the acceleration of gravity is 1.62 m/s2 and there is no air.To determine the depth of the crater,she drops a rock and measures the time it takes for it to hit the bottom.If the depth of the crater is 120 m,how long does it take for the rock to fall to the bottom of the crater?

Accepted Answer

A) 3.04 s 
B) 12.2 s 
C) 29.3 s 
D) 32.1 s 
E) 37.5 s 
A) 3.04 s 
B) 12.2 s 
C) 29.3 s 
D) 32.1 s 
E) 37.5 s

Question 14

A car is able to stop in a distance d.Assuming the same braking force (and therefore the same acceleration),what distance does this car require to stop when it is traveling twice as fast?

Accepted Answer

A) d 
B) 2d 
C)    d 
D) 4d 
E) 2   d 
A) d 
B) 2d 
C)    d 
D) 4d 
E) 2   d

Question 15

A toy rocket is launched vertically from ground level at time t = 0.00 s.The rocket engine provides constant upward acceleration during the burn phase.At the instant of engine burnout,the rocket has risen to 64 m and acquired an upward velocity of 60 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight,reaches maximum height,and falls back to the ground.The time interval during which the rocket engine provided the upward acceleration,is closest to

Accepted Answer

A) 2.1 s. 
B) 2.3 s. 
C) 1.9 s. 
D) 1.7 s. 
E) 1.5 s. 
A) 2.1 s. 
B) 2.3 s. 
C) 1.9 s. 
D) 1.7 s. 
E) 1.5 s.

Question 16

A car is traveling at 26.0 m/s when the driver suddenly applies the brakes,causing the car to slow down with constant acceleration.The car comes to a stop in a distance of 120 m.How fast was the car moving when it was 60.0 m past the point where the brakes were applied?

Accepted Answer

A) 22.5 m/s 
B) 18.4 m/s 
C) 15.0 m/s 
D) 12.1 m/s 
E) 9.20 m/s 
A) 22.5 m/s 
B) 18.4 m/s 
C) 15.0 m/s 
D) 12.1 m/s 
E) 9.20 m/s

Question 17

A car is traveling with a constant speed when the driver suddenly applies the brakes,causing the car to slow down with a constant acceleration of magnitude 3.50 m/s2.If the car comes to a stop in a distance of 30.0 m,what was the car's original speed?

Accepted Answer

A) 10.2 m/s 
B) 14.5 m/s 
C) 105 m/s 
D) 210 m/s 
E) 315 m/s 
A) 10.2 m/s 
B) 14.5 m/s 
C) 105 m/s 
D) 210 m/s 
E) 315 m/s

Question 18

A ball is projected upward at time t = 0 s,from a point on a flat roof 90 m above the ground.The ball rises and then falls with insignificant air resistance,missing the roof,and strikes the ground.The initial velocity of the ball is  
Consider all quantities as positive in the upward direction.The vertical velocity of the ball when it is  
Above the ground is closest to

Accepted Answer

A) -81 m/s. 
B) -64 m/s. 
C) -48 m/s. 
D) -32 m/s. 
E) -97 m/s. 
A) -81 m/s. 
B) -64 m/s. 
C) -48 m/s. 
D) -32 m/s. 
E) -97 m/s.

Question 19

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2.How much time is required for the car to reach a speed of 90 km/h?

Accepted Answer

A) 15 s 
B) 30 s 
C) 45 s 
D) 4.2 s 
A) 15 s 
B) 30 s 
C) 45 s 
D) 4.2 s

Question 20

An object moving in the +x direction experiences an acceleration of +2.0 m/s2.This means the object

Accepted Answer

A) travels 2.0 m in every second. 
B) is traveling at 2.0 m/s. 
C) is decreasing its velocity by 2.0 m/s every second. 
D) is increasing its velocity by 2.0 m/s every second. 
A) travels 2.0 m in every second. 
B) is traveling at 2.0 m/s. 
C) is decreasing its velocity by 2.0 m/s every second. 
D) is increasing its velocity by 2.0 m/s every second.

Exam 2: One-Dimensional Kinematics

A car travels at 15 m/s for 10 s.It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s.At the end of this time,what is its velocity?

Which of the following situations is impossible?

Two cars are traveling at the same speed and hit the brakes at the same time.Car A decelerates (decreases its velocity)at twice the rate of car B.If car A travels a distance D before stopping,how far does car B travel before stopping?

An object is moving with constant non-zero velocity in the +x direction.The position versus time graph of this object is

In the absence of air resistance,a ball is thrown vertically upward with initial speed v.An identical ball is thrown upward with initial speed 2v.If the first ball reaches a maximum height h,what maximum height will the second ball reach?

A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance.If it takes the 20-kg rock a time T to reach the ground,what time will it take the 10-kg rock to reach the ground?

An object is moving with constant non-zero acceleration in the +x direction.The velocity versus time graph of this object is

An object moves 15.0 m north and then 11.0 m south.Find both the distance it has traveled and the magnitude of its displacement.

A car accelerates from 5.0m/s To 21 m/s At a constant rate of 3.0 m/s2. How far does it travel while accelerating?

An object is moving with constant non-zero acceleration in the +x direction.The position versus time graph of this object is

Suppose that a car traveling to the east (+x direction)begins to slow down as it approaches a traffic light.Which statement concerning its acceleration must be correct?

A car is able to stop in a distance d.Assuming the same braking force (and therefore the same acceleration),what distance does this car require to stop when it is traveling twice as fast?

A car is traveling at 26.0 m/s when the driver suddenly applies the brakes,causing the car to slow down with constant acceleration.The car comes to a stop in a distance of 120 m.How fast was the car moving when it was 60.0 m past the point where the brakes were applied?

A car is traveling with a constant speed when the driver suddenly applies the brakes,causing the car to slow down with a constant acceleration of magnitude 3.50 m/s2.If the car comes to a stop in a distance of 30.0 m,what was the car's original speed?

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2.How much time is required for the car to reach a speed of 90 km/h?

An object moving in the +x direction experiences an acceleration of +2.0 m/s2.This means the object

Introduction to Physics

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Newtons Laws of Motion

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A car travels at 15 m/s for 10 s.It then speeds up with a constant acceleration of 2.0 m/s² for 15 s.At the end of this time,what is its velocity?

A car accelerates from 5.0m/s To 21 m/s At a constant rate of 3.0 m/s². How far does it travel while accelerating?

A car is traveling with a constant speed when the driver suddenly applies the brakes,causing the car to slow down with a constant acceleration of magnitude 3.50 m/s².If the car comes to a stop in a distance of 30.0 m,what was the car's original speed?

A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s².How much time is required for the car to reach a speed of 90 km/h?

An object moving in the +x direction experiences an acceleration of +2.0 m/s².This means the object