Enter the relative velocity after collision (m/s) and the relative velocity before collision (m/s) into the Calculator. The calculator will evaluate the Coefficient of Restitution. 

Coefficient of Restitution Formula

e = V2rel / V1rel

Variables:

  • e is the Coefficient of Restitution ()
  • V2rel is the relative velocity after collision (m/s)
  • V1rel is the relative velocity before collision (m/s)

To calculate the Coefficient of Restitution, divide the velocity after the collision by the velocity before the collision.

How to Calculate the Coefficient of Restitution?

The following steps outline how to calculate the Coefficient of Restitution.


  1. First, determine the relative velocity after collision (m/s). 
  2. Next, determine the relative velocity before collision (m/s). 
  3. Next, gather the formula from above = e = V2rel / V1rel.
  4. Finally, calculate the Coefficient of Restitution.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

relative velocity after collision (m/s) = 35

relative velocity before collision (m/s) = 60