A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. (a) Compare : (i) the work done, and (ii) the power developed by them. (b) Calculate : (i) the work done, and (ii) the power developed by each man. Take g = 10 N kg-1.
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W.D = mgh therefore W.D by both men =50x2x10=1000 joules
power = W.D/t
(man 1)= 1000/ 20 =50 watts
(man 2)= 1000/50 = 20watts
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