A) \[-mg\frac{L}{2}\]
B) \[-\frac{mg\,L}{4}\]
C) \[-\frac{3mg\,L}{8}\]
D) \[-\frac{mg\,L}{8}\]
Correct Answer: C
Solution :
[c] The work done by man is negative of magnitude of decreases in potential energy of chain \[\Delta U=mg\frac{L}{2}-\frac{m}{2}g\frac{L}{4}=3mg\frac{L}{8}\therefore W=\frac{3mgL}{8}\]You need to login to perform this action.
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