A body of mass $M$ moves with velocity $v$ and collides elastically with a another body of mass $m$ ($M>>m$) at rest then the velocity of body of mass $m$ is
$v$
$2v$
$v/2$
$Zero$
A body of mass $M$ moves with velocity $v$ and collides elastically with a another body of mass $m$ ($M>>m$) at rest then the velocity of body of mass $m$ is
When target is very light and at rest then after head on elastic collision it moves with double speed of projectile i.e. the velocity of body of mass $m$ will be $2v$.