# Thread: Momentum and coefficient of restitution

1. ## Momentum and coefficient of restitution

We performed an experiment in which we dropped different balls onto different surfaces in order to find different values of the coefficient of restitution.

The time from the first impact to the second impact is given by:

t2 =2e(2H/g)^1/2

it can be shown that

T = ((2H/g)^1/2)((1+e)/(1-e))