Physics - Center of Mass Question with Solution | TestHub

Two identical balls of mass M and radius R are placed in contact with each other on a frictionless horizontal surface as shown. The third ball of mass M and radius R/2 moves vertically downward and hits the two balls symmetrically with speed$\sqrt{5}\mathrm{m}/\mathrm{s}$ and comes to rest. Find the speed of any one of the bigger balls after collision if bigger balls are moving horizontally after collision.