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  4. The negative of the work done by the conservative internal forces on a system equals to the change in

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Q. The negative of the work done by the conservative internal forces on a system equals to the change in

Work, Energy and Power

Solution:

Relation between conservative force and potential energy is,
$F _{\text {cons }}=- dU / dx $
$F _{\text {cons }} \cdot dx =- dU$
$- W =-\int F _{\text {cons }} \cdot dx =\Delta U$