a man waighing 80 kg carries a stone of 20 kg to the top of the bullding 30 m high the work done by him is ( g = 9 .8 m per squir )
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29,400Joules
Mass= 80+20=100.
force =mg (mass×gravity)
=100×9.8
=980N
Displacement=30m
WORKDONE=F×S(force×displacement)
=980×30
=29,400
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