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Question

The power output of an engine is 3 kW. How much work does the engine do in 20 s ?

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Solution

Power output of an engine = 3kW = 3000W
Time taken = 20 seconds
Energy consumed = work done
Let work done be W.
Power = Work done/ Time taken
3000 = W/20
3000 x 20 = W
W = 60000 J

Hence Work done = 60000 J = 60kJ.

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