Calculate elasticity of collision from kinetic energy loss?

1. Nov 30, 2014

Sewager

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?

2. Nov 30, 2014

Sewager

Any help is appreciated, thank you!

3. Nov 30, 2014

haruspex

What definition do you have for elasticity?

4. Nov 30, 2014

Sewager

5. Nov 30, 2014

haruspex

That doesn't define elasticity. You need a definition to have any hope of answering the question.
The concept of a coefficient of elasticity arises in many diverse subjects. In collisions, the more usual term is the coefficient of restitution: http://en.wikipedia.org/wiki/Coefficient_of_restitution. See if that helps.

6. Nov 30, 2014

Sewager

Ah, this is exactly what I m looking for, thank you so much!