Question 1

The coordinate-time graph of an object is a straight line with a positive slope.The object has:

Accepted Answer

A) constant displacement 
B) steadily increasing acceleration 
C) steadily decreasing acceleration 
D) constant velocity 
E) steadily increasing velocity

Question 2

The diagram shows a velocity-time graph for a car moving in a straight line.At point P the car must be:

Accepted Answer

A) moving with zero acceleration 
B) climbing the hill 
C) accelerating 
D) stationary 
E) moving at about 45° with respect to the x axis

Question 3

A car starts from rest and goes down a slope with a constant acceleration of 5 m/s2.After 5 seconds the car reaches the bottom of the hill.What is its speed at the bottom of the hill?

Accepted Answer

A) 1 m/s 
B) 12.5 m/s 
C) 25 m/s 
D) 50 m/s 
E) 160 m/s

Question 4

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither.The time for this round trip is 2 hours.The average speed of the car for this round trip is:

Accepted Answer

A) 0 km/h 
B) 25 km/h 
C) 50 km/h 
D) 100 km/h 
E) cannot be calculated without knowing the acceleration

Question 5

Which of the following is NOT true of an object in free fall in the absence of air resistance?

Accepted Answer

A) Its acceleration is constant. 
B) If its initial velocity is upwards, it will reach a maximum height and then begin to fall. 
C) If its initial velocity is zero, its position below its starting point can be calculated knowing only how long ago it began falling. 
D) Its velocity will always be zero at some point along its path. 
E) Its velocity changes by the same amount every second.

Question 6

The diagram represents the straight line motion of a car.Which of the following statements is true?

Accepted Answer

A) The car's speed increases, then it stops, and reverses 
B) The car accelerates at 6 m/s2 for the first 2 s 
C) The car is moving for a total time of 12 s 
D) The car accelerates at -12 m/s2 for the last 4 s 
E) The car returns to its starting point when t = 9 s

Question 7

The area under a velocity-time graph represents:

Accepted Answer

A) acceleration 
B) change in acceleration 
C) speed 
D) change in velocity 
E) displacement

Question 8

At a stop light, a truck traveling at 15 m/s passes a car as it starts from rest.The truck travels at constant velocity and the car accelerates at 3 m/s2.How much time does the car take to catch up to the truck?

Accepted Answer

A) 5 s 
B) 10 s 
C) 15 s 
D) 20 s 
E) 25 s

Question 9

A stone is thrown vertically upward with an initial speed of 19.5 m/s.It will rise to a maximum height of:

Accepted Answer

A) 4.9 m 
B) 9.8 m 
C) 19.4 m 
D) 38.8 m 
E) none of these

Question 10

The velocity of an object is given as a function of time by v = 4t - 3t2, where v is in m/s and t is in seconds.Its average velocity over the interval from t = 0 s to t = 2 s:

Accepted Answer

A) is 0 
B) is -2 m/s 
C) is 2 m/s 
D) is -4 m/s 
E) cannot be calculated unless the initial position is given

Exam 2: Motion Along a Straight Line