. A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s.

(a) Compare: (i) the work done, and (ii) the power developed by them.

(b) Calculated: (i) the work done, and (ii) the power developed by each man. Take g = 10N kg^-1.

(a)

(i)Work done to raise the block of mass 50kg is same for both.

(ii) Power= Work done/time. As the time taken by the first man is less therefore power developed is more

(b)

(i)Work done = 50*10*2 = 1000 J

(ii) Power developed by first man=1000/20=50W

Power developed by second man=1000/50=20W

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