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Question

What is the work to be done to increase the velocity of a car from 30 km h1 to 60 km h1? If the mass of the car is 1500 kg?

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Solution

Initial velocity u=30 km/h=30×518=253 m/s

Final velocity v=60 km/h=60×518=503 m/s

Mass m=1500 kg

Work done W=12mv212mu2

W=m2(v2u2)=15002×((503)2(253)2)=156249.97 J

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