A closed system consists of a pendulum that is swinging back and forth. If the kinetic energy of the pendulum increases, what else must happen to the energy of the system?
A. Its total mechanical energy must increase.
B. Its gravitational potential energy must decrease.
C. Its total mechanical energy must decrease.
D. Its gravitational potential energy must increase.
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Answer:
answer is d gravity and potential maybe
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B. its gravitational potential energy must decrease
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