# How do you calculate the coefficient of restitution?

##### 1 Answer

Apr 19, 2015

The coefficient of restitution often denoted

This law states that: "in a system of colliding bodies(usually 2 bodies) the relative velocity of separation is directly proportional to the relative velocity of approach".

Mathematically expressed,

For a system of colliding bodies

The constant of proportionality is

Thus we have,

Thus, all you need to calculate **e** are the respective initial and final velocities of the two bodies involved in collision.