# Coefficient of restitution ( for an object)

## Description

The coefficient of restitution (COR) of two colliding objects is typically a positive real number between 0.0 and 1.0 representing the ratio of speeds after and before an impact, taken along the line of the impact. An object (singular) is often described as having a coefficient of restitution as if it were an intrinsic property without reference to a second object, in this case the definition is assumed to be with respect to collisions with a perfectly rigid and elastic object. The Coefficient of Restitution is equal to the Relative Speed After Collision divided by the Relative Speed Before Collision.

Related formulas## Variables

COR | The coefficient of restitution (dimensionless) |

RSAC | Relative Speed After Collision (m/s) |

RSBC | Relative Speed Before Collision (m/s) |