**11. A car accelerates from rest on a straight road. A short time later, the car decelerates to a**

**stop and then returns to its original position in a similar manner, by first speeding up**

**and then slowing to a stop. Which of the following five coordinate versus time graphs**

**best describes the motion?**

A) A

B) B

C) C

D) D

__E) E__**12. Throughout a time interval, while the speed of a particle increases as it moves along the**

*x***axis, its velocity and acceleration:**

A) might be in the positive and negative

*x*directions, respectivelyB) might be in the negative and positive

*x*directions, respectively

__C) might both be in the negative__*x*directionD) might be in the negative

*x*direction and zero, respectivelyE) might be in the positive

*x*direction and zero, respectively**13. At time**

*t*= 0 a car has a velocity of (16 m/s) î. It slows down with an acceleration given**by (–0.50 m/s**

**3**

**)**

*t*î. By the time it stops it has traveled:A) 15 m

B) 31 m

C) 62 m

__D) 85 m__E) 100 m

**14. 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:**

A) 0

__B) 50 km/h__C) 100 km/h

D) 200 km/h

E) cannot be calculated without knowing the acceleration

**15. Which of the following five coordinate versus time graphs represents the motion of an**

**object moving with a constant nonzero speed?**

A) A

__B) B__C) C

D) D

E) E

**16. The graph represents the straight line motion of a car. How far does the car travel**

**between**

*t*= 2 s and*t*= 5 s?A) 4 m

B) 12 m

C) 24 m

__D) 36 m__E) 60 m

**17. Over a short interval, starting at time**

*t*= 0, the coordinate of an automobile in meters is**given by**

*x*(*t*) = 27*t*– 4.0*t***3**

**, where**

*t*is in seconds. The magnitudes of the initial (at*t*= 0)**velocity and acceleration of the auto respectively are:**

A) 0; (12 m/s2) î

B) 0; (24 m/s2) î

__C) (27 m/s) î; 0__D) (27 m/s) î; (12 m/s2) î

E) (27 m/s) î; (24 m/s2) î

**18. A particle moves along the**

*x*axis according to the equation*x*= 6*t***2**

**, where**

*x*is in meters**and**

*t*is in seconds. Therefore:A) the acceleration of the particle is (6 m/s2) î

B)

*t*cannot be negativeC) the particle follows a parabolic path

D) each second the speed of the particle changes by 9.8 m/s

__E) none of the above__**19. Two automobiles are 150 kilometers apart and traveling toward each other on a straight**

**road. One automobile is moving at 60 km/h and the other is moving at 40 km/h mph. In**

**how many hours will they meet?**

A) 2.5

B) 2.0

C) 1.75

__D) 1.5__E) 1.25

**20. Over a short interval near time**

*t*= 0 the coordinate of an automobile in meters is given**by**

*x*(*t*) = 27*t*– 4.0*t***3**

**, where**

*t*is in seconds. At the end of 1.0 s the acceleration of the**auto is:**

A) (27 m/s2) î

B) (4.0 m/s2) î

C) (–4.0 m/s2) î

D) (–12 m/s2) î

__E) (–24 m/s__

__2__

__) î__**1. A ball is in free fall. Upward is taken to be the positive direction. The displacement of**

**the ball during a short time interval is:**

A) positive during both ascent and descent

B) negative during both ascent and descent

C) negative during ascent and positive during descent

__D) positive during ascent and negative during descent__E) none of the above

**2. An object is thrown straight down with an initial speed of 4 m/s from a window which is**

**8 m above the ground. The time it takes the object to reach the ground is:**

A) 0.80 s

__B) 0.93 s__C) 1.3 s

D) 1.7 s

E) 2.0 s

**3. A car travels east at constant velocity. The net force on the car is:**

A) east

B) west

C) up

D) down

__E) zero__**4. A freely falling body has a constant acceleration with a magnitude of 9.8 m/s**

**2**

**. This**

**means that:**

A) the body falls 9.8 m during each second

B) the body falls 9.8 m during the first second only

__C) the speed of the body increases by 9.8 m/s during each second__D) the magnitude of the acceleration of the body increases by 9.8 m/s2 during each

second

E) the magnitude of the acceleration of the body decreases by 9.8 m/s2 during each

second

**5. When a certain force is applied to the standard kilogram its acceleration is 5.0 m/s**

**2**

**.**

**When the same force is applied to another object its acceleration is one-fifth as much.**

**The mass of the object is:**

A) 0.2 kg

B) 0.5 kg

C) 1.0 kg

__D) 5.0 kg__E) 10 kg

**6. An object dropped from the window of a tall building hits the ground in 12.0 s. If its**

**acceleration has a magnitude of 9.80 m/s**

**2**

**, the height of the window above the ground**

**is:**

A) 29.4 m

B) 58.8 m

C) 118 m

D) 353 m

__E) 706 m__**7. One object is thrown vertically upward with an initial velocity of 100 m/s and another**

**object with an initial velocity of 10 m/s. The maximum height reached by the first**

**object will be ______ that of the other.**

A) 10 times

__B) 100 times__C) 1000 times

D) 10,000 times

E) none of these

**8. An object is thrown straight up from ground level with a speed of 50 m/s. If the**

**magnitude of the local gravitational strength is**

*g*= 10 N/kg its distance above ground**level 6.0 s later is:**

A) 0.00 m

B) 270 m

C) 330 m

D) 480 m

__E) none of these__**9. Three books (X, Y, and Z) rest on a table. The gravitational force on each book is**

**indicated. The net force on book Y is:**

A) 4 N down

B) 5 N up

C) 9 N down

__D) zero__E) none of these

**10. A feather and a lead ball are dropped from rest in vacuum on the Moon. The**

**acceleration of the feather is:**

A) more than that of the lead ball

__B) the same as that of the lead ball__C) less than that of the lead ball

D) 9.8 m/s2

E) zero since it floats in a vacuum