3. A person of mass 50 kg carries a case of 10 kg to the upstairs at a vertical height of 4 m. Calculate the work done by the man.
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answer: m 1=50kg,m 2= 10 kg Total mass= m 1+m 2 =50kg+10kg=60kg. h=4m. work done = F×s =ma×s=mg×h=mgh. work done= mgh. 60kg×9.8m/s2×4m =2352 Nm
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