A ball of mass m = 0.3 kg falls vertically downward and has speed 20 m/s just before hitting the floor. The ball then bounces vertically upward at the same speed. It is in contact with the ground for 0.08 s. Start Collision End Floor Which of the following is/are conserved from just before to just after the ball's collision with the floor? O (a) Kinetic energy v O (b) None O (c) Momentum O (d) Both momentum and kinetic energy 100% This question is complete and cannot be answered again