A ball A rolls of from the top of 10 m height wall. When it falls 4 m, another ball B strikes the ball A. Initially, ball B has a speed of 25 m/s as it moves upward. Each ball has same mass, 55 g and the coefficient of restitution given as 0.7. In the Figure Q4 below, ???? ₁  = 25° and ^???? ₁  = 18°.

 

(a) Determine the velocity of ball A immediately before the collision.

(b) Determine the x and y components of the final velocity of each ball just after the collision.

(c) When does the principle of linear impulse and momentum become conservation of linear momentum?

(d) Describe the type of impact for this collision and what is the assumption that you made before use the conservation of momentum?