A car of mass 800 kg is being driven with a constant acceleration 1.5 m/s2 on a straight road against a constant resistive force 72 N. When the speed of the car is 72 km/hr, the rate at which engine is doing work will be :

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25440 watt

28920 watt

27590 watt

26325 watt

answer is A.

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Detailed Solution

Rate of doing work = Power=Fv=[72+800(1.5)]72×518=25440W

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