A ball of mass 0.40kg is thrown at a wall. It strikes the wall with a speed of 1.5ms−1 perpendicular

A ball of mass 0.40kg is thrown at a wall. It strikes the wall with a speed of 1.5ms−1 perpendicular to the wall and bounces off the wall with a speed of 1.2ms−1. Explain the changes in momentum and energy which happen in the collision between the ball and the wall. Give numerical values where possible.