A ball of mass $2 \mathrm{~kg}$ collides with another ball of mass $\mathrm{M}$ at rest. If the collision is…
A ball of mass $2 \mathrm{~kg}$ collides with another ball of mass $\mathrm{M}$ at rest. If the collision is elastic and after the collision, the first ball moves with $\frac{1}{3}$ of its initial velocity in the same direction. then the mass of second ball is