The coefficient of restitution for a perfect elastic collision is
The coefficient of restitution for a perfect elastic collision is
$1$
$0$
$\infty$
$-1$
Solution
We know that, coefficient of restitution, for collision between two objects is
$e=\frac{\mathbf{v}_2-\mathbf{v}_1}{\mathbf{u}_1-\mathbf{u}_2}$
$=\frac{\text { Relative velocity of separation }}{\text { Relative velocity of approach }}$
which gives, $e=1$ (for elastic collision)
$e=0$ (for perfectly in-elastic collision)
$0 < e < 1$ (for inelastic collision)