A ball of mass 'm' approaches a wall of mass 'M' (gt gtm) with speed 4m/s along the normal to the wall. The speed of wall is 1m/s towards the ball. The speed of the ball after an elastic collision with the wall is

A ball of mass 'm' approaches a wall of mass 'M' (gt gtm) with speed 4

1.	A ball of mass 'm' approaches a wall of mass 'M' (gt gtm) with speed 4m/s along the normal to the wall. The speed of wall is 1m/s towards the ball. The speed of the ball after an elastic collision with the wall is
Answer» 5m/s AWAY from the wall 9m/s away from the wall 6m/s away from the wall 3m/s away from the wall Answer :C