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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.


The work done by gravity.


The work done by tension.


The work done by air resistance.


The pendulum does not lose mechanical energy.


There is not enough information to determine the cause.

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