<P> The coefficient of restitution ( COR ) is the ratio of the final to initial relative velocity between two objects after they collide . It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision . A perfectly inelastic collision has a coefficient of 0 , but a 0 value does not have to be perfectly inelastic . It is measured in the Leeb rebound hardness test , expressed as 1000 times the COR , but it is only a valid COR for the test , not as a universal COR for the material being tested . </P>
<P> The coefficient of restitution ( COR ) is the ratio of the final to initial relative velocity between two objects after they collide . It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision . A perfectly inelastic collision has a coefficient of 0 , but a 0 value does not have to be perfectly inelastic . It is measured in the Leeb rebound hardness test , expressed as 1000 times the COR , but it is only a valid COR for the test , not as a universal COR for the material being tested . </P>
for perfectly elastic body the value of coefficient of restitution is
for perfectly elastic body the value of coefficient of restitution is
1
1