15. A man raises a box of mass 50 kg to a heightof 2 m in 20 s, while

1.	15. A man raises a box of mass 50 kg to a heightof 2 m in 20 s, while another man raises the samebox to the same height in 50 s.(a) Compare : (i) the work done, and (ii) the powerdeveloped by them.(b) Calculate : (i) the work done, and (ii) the powerdeveloped by each man. Take g = 10 N kg-1.
Answer» Answer: Work done by both of them is same, but power developed by them is 50 WATT and 20 Watt respectively. Explanation: Work done by first MAN = mgh = 50 * 10 * 2 = 1000 J Work done 2nd man = mgh = 50 * 10 * 2 = 1000 J Power developed by 1ST man = Work / Time = 1000 / 20 = 50 Watt Power developed by 2nd man = Work / Time = 1000 / 50 = 20 Watt ∴ Work done by both of them is same, but power developed by them is 50 Watt and 20 Watt respectively.

15. A man raises a box of mass 50 kg to a heightof 2 m in 20 s, while another man raises the samebox to the same height in 50 s.(a) Compare : (i) the work done, and (ii) the powerdeveloped by them.(b) Calculate : (i) the work done, and (ii) the powerdeveloped by each man. Take g = 10 N kg-1.

Answer»

Answer:

Work done by both of them is same, but power developed by them is 50 WATT and 20 Watt respectively.

Explanation:

Work done by first MAN = mgh

= 50 * 10 * 2

= 1000 J

Work done 2nd man = mgh

= 50 * 10 * 2

= 1000 J

Power developed by 1ST man = Work / Time

= 1000 / 20

= 50 Watt

Power developed by 2nd man = Work / Time

= 1000 / 50

= 20 Watt

∴ Work done by both of them is same, but power developed by them is 50 Watt and 20 Watt respectively.

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15. A man raises a box of mass 50 kg to a heightof 2 m in 20 s, while another man raises the samebox to the same height in 50 s.(a) Compare : (i) the work done, and (ii) the powerdeveloped by them.(b) Calculate : (i) the work done, and (ii) the powerdeveloped by each man. Take g = 10 N kg-1.​

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15. A man raises a box of mass 50 kg to a heightof 2 m in 20 s, while another man raises the samebox to the same height in 50 s.(a) Compare : (i) the work done, and (ii) the powerdeveloped by them.(b) Calculate : (i) the work done, and (ii) the powerdeveloped by each man. Take g = 10 N kg-1.