Part A

A particular interaction force does work $W_{\text{i}\text{n}\text{t}}$ inside a system. The potential energy of the interaction is $U.$ Which equation relates $U$ and $W_{\text{i}\text{n}\text{t}}?$

$U=-W_{\text{i}\text{n}\text{t}}$

$U=W_{\text{i}\text{n}\text{t}}$

$U=-W_{\text{i}\text{n}\text{t}}$

$U=W_{\text{i}\text{n}\text{t}}$

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