For two bodies having direct impact, co-efficient of restitution is given by
1
\(\rm \frac{{Velocity\ of\ Separation}}{{Velocity\ of\ approach}}\)
2
\(\rm\frac{{Velocity\ of\ approach}}{{Velocity\ of\ separation}}\)
3
\(\rm \frac{{initial\ velocity\ of\ body}}{{final\ velocity\ of\ body}}\)
4
None of the above