Question: When a body is being acted on by a force and displaced by said force, work is done on the body. Which of the following

When a body is being acted on by a force and displaced by said force, work is done on the body. Which of the following scenarios has no average work done by forces on the body? [Hint: Take the average over many to a near infinite number of cycles of the motion.]
A. A car slamming on its breaks to slow down, but speeds up to regain its lost speed.
B. A spring oscillating back and forth around its equilibrium point.
C. A pendulum which swings, but eventually comes to a stop.
D. A heavy stone which undergoes free fall but does not bounce when it strikes the ground.

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