1. A mass of 5.25-kg was dropped from a height of 31 m. How much time does it take for the mass to reach the ground?

a. 9.8 seconds

b. 4.5 seconds

c. 4.0 seconds

d. 2.5 seconds

2. A rocket is accelerating at a constant rate of 30 m/s².How much time does it take for the rocket to increase its speed from 3000 m/s to 3600 m/s?

a. 20 s

b. 120 s

c. 200 s

d. 12 s

3. The position of a ball is given by x(t) = 30t - 3.0t². At what time is the ball stopped?

a. 1.0 s

b. 5.0 s

c. 6.0 s

d. 9.0 s

4. A rocket starts from rest and reaches a speed of 250 m/s in 5 s. What is its average acceleration?

a. 9.8 m/s²

b. 245 m/s²

c. 50 m/s²

d. 1250 m/s²

5. A motorcycle increases its speed from 5 m/s to 45 m/s over a distance of 55 m. How long does this take? Assume that the acceleration is constant.

a. 1.0 s

b. 5.5 s

c. 22.5 s

d. 2.2 s

e. Not enough information

6. A truck is stopped in 9.3 seconds from an initial speed of 16 m/s. What is the acceleration of the car?

a. -1.72 m/s²

b. -17.2 m/s²

c. 1.72 m/s²

d. 17.2 m/s²

7. A ball is thrown upward from the edge of a platform 15 m above the ground. The ball rises 12 m and then falls to the ground. What is the vertical displacement of the ball?

a. 15 m

b. -15 m

c. -27 m

d. 27 m

8. The applied brakes of a car cause it to accelerate at a rate of -4m/s²for 6 s. How far does it take to stop if its initial velocity is 24 m/s?

a. 24 m

b. 72 m

c. 28 m

d. 36 m

e. 144 m

9. A box, which is initially at rest, is moving with a constant acceleration of 1.20 m/s²over a distance of 32 m. What is the time required for the box to move this distance?

a. 5.16 s

b. 6.20 s

c. 7.30 s

d. 26.0 s

10. A moving car slows to a stop. What is the direction of the acceleration of the car?

a. to the right of the car

b. north

c. down

d. to the rear of the car

e. acceleration does not have direction

11. Accelerating means _____.

a. that there is a speed change

b. that there is a direction change

c. either a change in the speed or direction (or both)

d. that the velocity is large

12. A 5 kg mass object is shot vertically with an initial speed of 47 m/s from ground level. How fast is the object traveling just before it hits the ground? Assume that there is no air resistance.

a. greater than 47 m/s

b. equal to 47 m/s

c. less than 47 m/s

d. equal to 9.81 m/s

13. A car is moving with an initial speed of 30 m/s. The driver wishes to pass another car and accelerates at a rate of 0.7 m/s²for 6 seconds. How far does his car travel during this time and what is its final velocity? (round off)

a. 193 m at a velocity of 34 m/s

b. 205 m at a velocity of 34 m/s

c. 193 m at a velocity of 26 m/s

d. 205 m at a velocity of 26 m/s

14. A car starts from rest and moves with constant acceleration of a m/s²for t s. Then it travels with constant speed for another t s before it slows to a stop with constant acceleration of -a m/s². How far does it travel?

a. d = 2at²

b. d = 2at

c. d = at²

d. d = at

15. A vehicle is traveling at 15 m/s, when it starts accelerating at a constant acceleration of 3 m/s². How long must it accelerate before its average velocity, after it starts to accelerate, is equal to three times its initial velocity?

a. 15 s

b. 20 s

c. 25 s

d. 30 s

16. An object that is dropped from the top of a building has a velocity of 30.7 m/s just before it hits the ground. How high is the building?

a. 96 m

b. 48 m

c. 301 m

d. 602 m

17. A car accelerates at 4 m/s²for 5 seconds and then accelerates at 1 m/s²for another 5 seconds from initial velocity v₁to final velocity v_2.How does this affect the average velocity?

a. no change

b. it will be greater then the average of v₁and v₂

c. It will be less than the average of v₁and v₂

e. none of the above

18. The horizontal position of a vehicle as a function of time is given by x = 2t²- 2t³. What is its average acceleration over the time interval from t = 0 to t = 2 s?

a. -4 m/s

b. 4 m/s

c. -6 m/s

d. 8 m/s

e. -8 m/s