A mass '$m$' moves with a velocity $v$ and collides inelastically with another identical mass. After collision the $1^{\text{st}}$ mass moves with velocity $v/\sqrt{3}$ in a direction perpendicular to the initial direction of motion. Find the speed of the $2^{\text{nd}}$ mass after collision\\
(1) v\\
(2) $\sqrt{3}\,v$\\
(3) $2v/\sqrt{3}$\\
(4) $v/\sqrt{3}$