1. The problem statement, all variables and given/known data A tennis ball of mass m is held just above a basketball of mass M. Their centers are vertically aligned. Both are released at the same moment, and fall a distance of h until the basketball hits the ground, which it rebounds from elastically, and then undergoes an elastic collision with the tennis ball. How high up does the tennis ball go? 2. Relevant equations P = mv E=1/2mv^2 + mgh 3. The attempt at a solution i figured that since all the collisions in this problem are elastic all the energy is conserved so the tennis ball should technically return to the height that its droped from but I don't think thats the right answer. Please any help would be appreciated!!!