A ball of mass m strikes a rigid walJ with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is

A ball of mass m collides with a wall with speed v and rebounds on the same line with the same speed. If the mass of the wall is taken as infinite, then the work done by the ball on the wall is

A ball of mass m collides with a wall with speed v and rebounds on the same line with the same speed. If the mass of the wall is taken as infinite, then the work done by the ball on the wall is

Two billiard ball A and B each of mass 50g and moving in opposite direction with speed of 5ms^(-1) each, collide and rebound with the same speed. The impulse imparted to each ball is

Two billiard ball A and B each of mass 50g and moving in opposite direction with speed of 5ms^(-1) each, collide and rebound with the same speed. The impulse imparted to each ball is