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  4. Assertion: No work is done if the displacement is zero. Reason: Work done by the force is defined to be the product of component of the force in the direction of the displacement and the magnitude of displacement.

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Q. Assertion : No work is done if the displacement is zero.
Reason : Work done by the force is defined to be the product of component of the force in the direction of the displacement and the magnitude of displacement.

Work, Energy and Power

Solution:

Work done
$W = Fd \,cos\, \theta$
if displacement is zero, i.e. $d = 0$, $W = 0$