An engine lifts a load of $1200 N$ from a depth of $200 m$ in 4 minutes bringing it to the ground level. The power developed by the engine is:

500 W

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5000 W

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10000 W

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1000 W

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Solution

The correct option is D $1000 W$
Power $=$ work done per unit time.
Work done in bringing the 1200 N load upto a level of 200 m is $1200 \times 200 = 240000 J$ .
This is done in $4 m i n = 240 s$
Thus, power $= \frac{240000 J}{240 s} = 1000 W$

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