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The potential energy of a system increases if work is done:

1. upon the system by a non conservative force
2. by the system against a conservative force
3. by the system against a non conservative force
4. upon the system by a conservative force

Correct answer: by the system against a conservative force

Solution

The potential energy of a system increases when work is done by the system against a conservative force, as this work is stored as potential energy in the system.

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