If the work done on a body at two instances in 20 s and 40 s are same, then what is the ratio of the powers?

2:1

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1:2

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1:4

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4:1

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Solution

The correct option is A
2:1

Power, $P = \frac{W o r k d o n e}{T i m e t a k e n}$
As work done is constant, power is inversely proportional to time taken, hence power ratio = 2:1

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