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A pendulum rocks back and forth. In an ideal setting, this motion would go on perpetually without loss of mechanical energy. Realistically, if you held a pendulum up and made it go in motion, it would slow to a stop.

What is responsible for the pendulum gradually losing mechanical energy? Ignore the mass of the string holding the pendulum bob in motion.

A

The work done by gravity.

B

The work done by tension.

C

The work done by air resistance.

D

The pendulum does not lose mechanical energy.

E

There is not enough information to determine the cause.

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