why work is not done when a force acts at right angles to the direction of displacement
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Work done in the abive case is zero because work done is written as
w= Fs cos¤
in case if above situation angle is 90 but cos 90 is zero so work done is also zero
w= Fs cos¤
in case if above situation angle is 90 but cos 90 is zero so work done is also zero
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