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Q.

A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/hour in 5 s. The average power (W) of the engine during this period in watts is (neglect friction)

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answer is 22500.

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Detailed Solution

Power=Work donetime=Increase in K.E.timeP=12mv2t=12×103×(15)25=22500 W

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A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/hour in 5 s. The average power (W) of the engine during this period in watts is (neglect friction)