2 children , A and B each weighing 50 kg start climbing up a rope separately . A takes 20s while B takes 25s to reach a height of 8m . what is the work done by each . who has done more work in 1s ? name the term used for work done in unit time .

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Solution

Work done against the gravitational force by both the persons is same = mgh
work done = 50x10x8 = 4000 J
Both have different power.
Work done per unit tine is known as power.
Power of A = Work done / time = 4000 / 20 = 200 watt
Power of B = Work done / time = 4000 / 25 = 160 watt
A has done more work in one second than B.

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