1. The problem statement, all variables and given/known data How is the height if the ball affected by the surface of which it bounces? And does it have something to do with the formula below? What does the formula mean in a easy to understand manner? Thanks a lot! 2. Relevant equations e = (V2 - V1) / (U1 - U2) 3. The attempt at a solution i think it has something to do with the amount of harness the surface has.