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

Answer

Power $= 3kW$
Time $= 20s$
$\text{Power}=\frac{\text{Work done}}{\text{Time}}$
Work done = Power $\times $ time $= 3 \times 20kWs = 60kJ$

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