STATEMENT-1 : If the net work done by forces other than conservative forces is zero, then mechanical energy is conserved.
STATEMENT-2 : The work done by non-conservative forces is always negative.

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Statement -1 is true, statement -2 is true; statement -2 is the correct explanation for statement -1.

Statement -1 is true, statement -2 is true; statement -2 is NOT the correct explanation for statement -1.

Statement -1 is true, statement -2 is false.

Statement -1 is false, Statement -2 is true.

answer is C.

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Detailed Solution

$W_{N C} = Δ (T E)$

If $W_{N C} = 0,$ then $T E = P E + K E$ is conserved. Work done by non conservative force can be + ve or – ve or zero.

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