1. The problem statement, all variables and given/known data a rubber ball mass of 0.08 kg bounces vertically on a concrete floor. the ball strikes the floor at 10 ms-1 and rebounds at 8 ms-1. The time in contact with the floor is 0.05 sec. Calculate the average net force acting on the ball during the contact with the floor. 2. Relevant equations E=F/t F=0.5mv^2 3. The attempt at a solution (0.5x0.08x10^2)/0.05 = 80N I get a force of 80 N but to me it seems to much to be true... Help???