A) negative work
B) positive but not maximum work
C) maximum positive work
D) no work at all
E) maximum negative work
Correct Answer: D
Solution :
Work done \[(W)=\overrightarrow{F}\cdot \overrightarrow{s}\] \[=Fs\cos \theta \] When a man pushes against a wall but fails to move it, then displacement of wall \[(\overrightarrow{s})=0\] \[\therefore \] Work done \[(W)=F\times 0\times \cos \theta \] \[=0\] Therefore, man does no work at all.
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