A ball moving with a velocity v strikes a wall moving towards the ball with a velocity u. An elastic impact occurs. Determine the velocity of ball after the impact. What is the cause of change in kinetic energy of the ball? Consider the mass of the wall to be infinitely large.

A ball moving with a velocity v strikes a wall moving towards the ball

1.	A ball moving with a velocity v strikes a wall moving towards the ball with a velocity u. An elastic impact occurs. Determine the velocity of ball after the impact. What is the cause of change in kinetic energy of the ball? Consider the mass of the wall to be infinitely large.
Answer» ANSWER :`- (V + 2U) , K.E` of BAL due to workdone by the WALL