A force should act on the object
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In both the cases work is not done.
Reasons
1st case:- The angle of displacement is 90 degree.
W=Fs cos theta
W= Fs x 0 (cos90=0)
W=0
2nd case:- Displacement is 0
Reasons
1st case:- The angle of displacement is 90 degree.
W=Fs cos theta
W= Fs x 0 (cos90=0)
W=0
2nd case:- Displacement is 0
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