Two boys weighting in the ratio 4:5 goes up stair taking time in the ratio 5:4. The ratio of their power is:
Correct answer: B. 16/25
- A. 1
- B. 16/25
- C. 25/16
- D. 4/5
Explanation
Power of first boy / Power of second boy ∝ (Weight of first boy / Weight of second boy) × (Time taken by second boy / Time taken by first boy)Power of first boy / Power of second boy ∝ (4/5) × (4/5) = 16/25
This question appeared on the ETEA MDCAT 2017 paper, which you can sit online with every answer explained.
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About Power
Power is the rate at which work is done or energy is transferred, with average power calculated over a time interval and instantaneous power found from P = Fv when force and velocity are aligned. Work includes units, mechanical efficiency, and the distinction between power and total work or energy.
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