Considering the law of conservation of energy, we believe that a super-duper bouncy ball should keep bouncing - forever. Yet, we know that it eventually stops.

How is energy conserved or is it?
a. Some is converted into sound energy and escapes into the surroundings.
b. Some is converted into thermal energy and escapes into the surroundings.
c. Neither A. or B.
d. Both A. and B.

D. Both A. and B.

The correct answer is D: Both A. and B.