Science, asked by prashnachiluwal, 5 months ago

A coolie of 40 kg weight carries 20 kg salt and climbs up 20 steps of 20
centimeters each in 2 minutes. Calculate the work done by him and his power.
[g= 10 m/s^2]

Answers

Answered by abhishekyadavg9443
2

Answer:

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Explanation:

(i) Gravitational force acting on the girl = Her mass in kg x g 

= 40 x 10 = 400 N

(ii) Total gravitational force = (Mass of girl + load) x g.

= (40 + 20) x 10 = 600 N.

and Distance or height = 80 x 25/100 = 20 m.

∴ Work done by her = 600 N x distance

∴ Total work done = 60 N x 20 m = 12000 J.

(iii) Useful work done = Load x g x distance covered 

= 20 x 10 x 20 = 4000 J.

(iv) Power = Total work done/ Time

= 12000/25W = 480 W.

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