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Physics, 26.10.2020 22:00 shayneseaton

A closed system consists of a pendulum that is swinging back and forth. If the pendulum's gravitational potential
energy decreases, what else must happen to the energy of the
system?
O A. Its total mechanical energy must decrease.
O B. Its kinetic energy must decrease.
O C. Its kinetic energy must increase.
D. Its total mechanical energy must increase.

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