Wed December 07, 2011 By:
How much work is done by a man weighing 80kgf in raising a stone of weight 20 kgf to the top of a building of height 40 m(g=9.8 m/s

mam urgent

Expert Reply
Wed December 07, 2011
because he is going against gravity. so he is doing work against gravity in pulling stone as well as himself also. so his mass also is taken into account.
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