Question

1. A 2 kg ball collides inelastically head-on with a 5 kg ball, which is initially stationary. Which of the following statements is true?

A. Since the collision is inelastic, both balls lose all momentum.

B. The magnitude of the change in velocity is equal for both balls.

C. The magnitude of the change of velocity the 2 kg ball experiences is less than that of the more massive ball.

D.The magnitude of the change of velocity the 2 kg ball experiences is greater than that of the more massive ball.

2.The illustration below shows systems of two balls traveling in different directions that are about to collide. The balls are the same shape, have different masses and velocities as shown. Rank the magnitude of the momentum of each system after the balls collide from greatest to least.

A. A=B=C=D

B.A = B, C = D

C.B, C, A = D

D. A, C=D, B

3.What happens to the kinetic energy if velocity increases by a factor of 2?

A.KE increases by a factor of 4

B.KE is decreased by a factor of 2

C.KE does not change

D.KE doubles

Answer 1

O solution (4) mi= 2 kg m2=5 kg collision is inelastic ov means both move togther after rest collision before collision >> By conservation of momentum (mitmej v= mi viss vo= 241 ou Aſter collision change in Vi-v=5 su 28, -> ophon D correct V=207 9 velouty of mi- 7 ma 7 solution 2 (mussing Figure. No. ellustration shown) solution ③ We know that KE. = 4 mua Kinetic energy depends upon the square of speed on increasing velouty 2 time Kinetic energy will 2² = 4 times -> → Ke increases by a factor of 4 increase