Coefficient of Restitution

1. Sep 26, 2012

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

2. Sep 26, 2012

CWatters

Conservation of energy.

3. Sep 26, 2012

bionut

YEs, I thought of that... but dont know the mass of the ball?

4. Sep 26, 2012

SammyS

Staff Emeritus
Use m for the mass of the ball.

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

Last edited: Sep 26, 2012
5. Sep 27, 2012

hms.tech

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

6. Sep 28, 2012

SammyS

Staff Emeritus
Some mechanical energy is lost in the bounce. Thus there is a coefficient of restitution.