An engine develops 10 kW of power. How much time will it take to lift a mass of 200kg to a height of 40m (g = 10 $m s^{- 2}$ )?

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10s

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Solution

The correct option is C 8s
Power is work done per unit time .
Work required to be done is $200 \times 10 \times 40$ $= 80000 J$
So time taken to produce this much of energy by $10000$ watt power is 8sec.

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