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  4. If u1 and u2 be the initial velocities and v1, and v2 be the final velocities of the colliding particles then we define coefficient of restitution e as:e=- (v1-v2/u1-u2) For perfectly inelastic collision 'e' is

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Q. If $u_{1}$ and $u_{2}$ be the initial velocities and $v_{1}$, and $v_{2}$ be the final velocities of the colliding particles then we define coefficient of restitution $e$ as:$e=-\frac {v_{1}-v_{2}}{u_{1}-u_{2}}$
For perfectly inelastic collision $'e'$ is

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Solution:

For perfectly inelastic collision: $v_{1} = v_{2}$