In which of the following cases Potential Energy of system increases

When work done by conservative forces is positive

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When work done by conservative forces is negative

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When work done by conservative forces is zero

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When non-conservative forces are not present in the system

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Solution

The correct option is B When work done by conservative forces is negative
Change in poential energy is negative of Work done by conservative force $Δ U = - W_{C o n s e r v a t i v e}$
Therefore when Work done by conservative force is negative then Potential Energy increases.
Hence, Option B is correct.

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K_{A} = 70 J, U_{A} = - 50 J, K_{B} = - 20 J

U_{B} = 30 J

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