Answer :

according to question,

When a man of mass m ,climbs up the staircase of height L


work done by gravitational force on man =-mgL


work done by muscular forces=- (work done against gravitational


force) =mgL


work done by all the forces =mgL-mgL=0


as the point of application of contact forces does not move


so, work done is zero.


option (b, d) is correct.

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