Two identical particles move towards each other with velocity $2v$ and $v$ respectively. The velocity of centre of mass is (1) $v$ (2) $v/3$ (3) $v/2$ (4) zero
Two identical particles move towards each other with velocity $2v$ and $v$ respectively. The velocity of centre of mass is\\
(1) $v$\\
(2) $v/3$\\
(3) $v/2$\\
(4) zero