1. The problem statement, all variables and given/known data After a lot of searching I can't seem to find a way to solve this. Basically, for a bouncing ball, if I know the dropped height and rebound height in a vacuum. How do I calculate the elasticity between the ball and the floor? 2. Relevant equations K = 1/2 mv2 3. The attempt at a solution I did a lot of searching online...but I still have no idea. I tried to calculate kinetic energy loss, but what's after that?