A ball of mass $2 \mathrm{~g}$ moving with a velocity of $2 \mathrm{~ms}^{-1}$ collides with another ball of…
A ball of mass $2 \mathrm{~g}$ moving with a velocity of $2 \mathrm{~ms}^{-1}$ collides with another ball of mass $8 \mathrm{~g}$ which is at rest and comes to rest after collission. Then the coefficient of restitution is