Self-Test: Vector Kinematics 1D and 2D Test #1
Suggested Time: 45 minutes

1. An object is launched over level ground at 35° above the horizontal with an initial speed of 52 m/s. What is the time of flight?
 A. 5.3 s B. 6.1 s C. 8.7 s D. 11 s

2. A ball is kicked into the air from the surface of a playing field. If friction is negligible, the ball will follow a path that is
 A. circular. B. elliptical. C. parabolic D. hyperbolic.

3. A rock is thrown from ground level at 18 m/s, 25° above horizontal. What are the vertical and horizontal components of its launch velocity?
 VERTICAL COMPONENT HORIZONTAL COMPONENT A. 16 m/s 7.6 m s B. 7.6 m/s 16 m/s C. 20 m/s 9.3 m/s D. 9.3 m/s 20 m/s

4. A motorcycle accelerates uniformly from 12 m/s to 30 m/s while travelling 420 m. Its acceleration is
 A. 0.043 m/s2 B. 0.050 m/s2 C. 0.10 m/s2 D. 0.90 m/s2

5. A ball is thrown from level ground at 24 m/s, 30° above horizontal. How much time will it take to reach its maximum height?
 A. 1.2 s B. 2.1 s C. 2.4 s D. 7.3 s

6. The graph shown below displays velocity v versus time t for a moving object. The slope of this graph represents the object's

 A. mass. B. momentum. C. acceleration. D. displacement.

7. The projectile shown below has an acceleration which is A. zero. B. in the direction of P. C. in the direction of Q. D. in the direction of R.

8. When a 2.0 kg rock is dropped from a cliff it hits the beach at 24 m/s. At what speed would a 4.0 kg rock, dropped from the same cliff, hit the beach? Ignore friction.
 A. 12 m/s B. 24 m/s C. 34 m/s D. 48 m/s

9. Which of the following statements concerning vector and scalar quantities is incorrect
 A. All scalar quantities have direction. B. All vector quantities have direction. C. All scalar quantities have magnitude D. All vector quantities have magnitude.

10. Starting from rest, a jet takes 25 s and needs 1500 m of runway to become airborne. What is its speed when it leaves the ground?
 A. 60 m/s B. 120 m/s C. 250 m/s D. 1500 m/s

11. At t = 0 s a ball rolls off the edge of a vertical cliff. At t = 2.0 s the ball is 6.0 m from the cliffshown. How far is the ball from the cliff at t = 4.0 s? A. 6.0 m B. 9.0 m C. 12 m D. 24 m

12. A rock is released from the top of a 30 m-high cliff at the same time as a ball is thrown upwards from the base of the cliff at 20 m/s. How much time elapses before they collide?
 A. 1.0 s B. 1.2 s C. 1.5 s D. 2.5 s

13. Which of the following remain(s) constant for a projectile: its horizontal velocity component, vH , its vertical velocity component, vV , its vertical acceleration, g?
 A. vV B. g and vV C. g and vH D. g, vH and vV

14. Which of the following graphs represents the horizontal velocity component (Vx) versus time for a projectile thrown horizontally off a cliff? (Ignore air resistance.) 15. A skier accelerates uniformly from 5.2 m/s to 12.8 m/s at 0.85 m/s2 . Find the distance she travels.
 A. 7.7 m B. 8.9 m C. 11 m D. 80 m

16. At what speed must a ball be thrown upwards to reach a maximum height of 25 m?
 A. 2.6 m/s B. 22 m/s C. 2.5 x 102 m/s D. 3.1x 103 m/s

17. A projectile is launched over level ground with a speed of 240 m/s at 35° to the horizontal. If friction is negligible, what is the height of the projectile 17 s after launch?
 A. 9.2 x 102 m B. 1.9 x 103 m C. 2.7 x 103 m D. 5.5 x 103 m

18. A ball is rolled off a horizontal roof at 16 m/s. After leaving the roof, how long will the ball take to reach a speed of 18 m/s?
 A. 0.20 s B. 0.84 s C. 1.8 s D. 2.5 s

19. A car is travelling at a constant speed of 26.0 m/s down a slope which is 12.0° to the horizontal. What is the vertical component of the car's velocity?
 A. 5.41 m/s B. 9.80 m/s C. 25.4 m/s D. 26.0 m/s

20. A rock is thrown from a clifftop at 18 m/s, 25° above the horizontal. It lands on the beach 4.2 s later. a) What is the height h of the cliff? (4 marks)

b) How far from the base of the cliff d did the rock land? (3 marks)

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