A man pushes a wall and fails to displace it.He does
A. negative work
B. positive but not maximum work
C. maximum positive work
D. no work at all
A. negative work
B. positive but not maximum work
C. maximum positive work
D. no work at all
Correct Answer – D
(d) As, work done (W) `=F.s =F s costheta` When a man pushes against a wall but fails to move it, then displacement of wall, s=0
`:. “Work done”, W=Fxx0xx cos theta =0` Therefore, man does no work at all.