I'm not sure how this can be solved if their is only two velocities?
Two balls are approaching each other head-on. Their velocities are +9.95 and -11.4 m/s.
(a) Determine the velocity of the center of mass of the two balls if they have the same mass.
(b) Determine the velocity of the center of mass of the two balls if the mass of one ball (v = 9.95 m/s) is twice the mass of the other ball (v = -11.4 m/s).