The coefficient of restitution $e$ for a perfectly inelastic collision is
The coefficient of restitution $e$ for a perfectly inelastic collision is
$1$
$0$
$\infty $
$-1$
The coefficient of restitution $e$ for a perfectly inelastic collision is
Coefficient of restitution is the ratio between Relative velocity of separation to Relative velocity of approach of colliding bodies.
In perfectly inelastic collision, the two bodies stay togethere after collision and hence the relative velocity of separation is $zero.$
Therefore, coefficient of restitution is $zero.$
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