Physics - Center of Mass Question with Solution | TestHub

A small ball falling vertically downward with constant velocity 4m/s strikes elastically a massive inclined cart moving with velocity 4m/s horizontally as shown (incline at 45°). The velocity of the rebound of the ball is found to be$4\sqrt{\alpha }\mathrm{m}/\mathrm{s}$. Find the value of $\alpha$.