let us consder that the man applies a force F on the rope downwards.hence tension created in rope is F.

 

as man pulls rope downwards the rope exerts a force Fon man upwards (newtons 3rd law).hence the wt of man would be Mg-F.

 

total downward force is (Mg-F) +mg

 

frictional force((Mg-F) +mg)).....1

 

tension in string=F....2

 

equate 1&2

F=((Mg-F) +mg))

 

get F.

 

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