Question

15. 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.
Ans. (a) (i) 1:1 (ii) 5:2,
(b) (i) 1000 J, 1000 J (ii) 50 W, 20 W​

Answer 1

Answer:

A man raises a box of mass 50kg to a height of 2m in 10s , while another man rises the same box to the same height in 50s. Compare :

(i) the work done, and

(ii) the power developed by them.

Explanation:

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