Final answer:
The loss of kinetic energy of the ball during the collision can be explained by the principle of conservation of energy.
Step-by-step explanation:
The loss of kinetic energy of the ball during the collision can be explained by the principle of conservation of energy. When the ball hits the floor, it transfers some of its kinetic energy to the floor, causing the ball to lose energy and bounce back with less height. This transfer of energy is due to the conversion of kinetic energy to potential energy and vice versa. Specifically, the ball loses energy as it compresses upon impact and gains energy as it decompresses and bounces back.