# Coefficient of Restitution

bionut
Hi all, I know this may see basic but how would I go about calcualting Impact velovity?

The only information I have is:
Height dropped, height bounced and from here I can calculate the CofR...

But how would I go about finding impact velocity

Homework Helper
Gold Member
Conservation of energy.

bionut
YEs, I thought of that... but don't know the mass of the ball?

Staff Emeritus
Homework Helper
Gold Member
Yes, I thought of that... but don't know the mass of the ball?
Use m for the mass of the ball.

Both KE & PE are proportional to the mass, m.

Last edited:
hms.tech
Hi all, I know this may see basic but how would I go about calcualting Impact velovity?

The only information I have is:
Height dropped, height bounced and from here I can calculate the CofR...

But how would I go about finding impact velocity

I don't get the question, i think it is wrong just because there is no need for the Coefficient of Restitution to find the impact (final ) velocity .

The Equations for constant acceleration , once applied would be used to find the Impact velocity AND the rebound velocity

Staff Emeritus