Question

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What is the work done increase velocity of a car from 36 kilometre per hour to 72 kilometre per hour if the mass is 1500 kg ??

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Answer 1

The velocity of a car increases from 54 km/h to 72 km/h . If the mass of the car is 1500 kg , find the work done to increase the velocity.

Answer 2

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Initial Velocity, u=54km/hr=15m/s

Final velocity , v=72km/hr=20m/s

Mass =1500kg

Initial kinetic energy 1/2 mu²

⇒ 1/2 1500×15×15=168750J

Final kinetic energy 1/2 mv²

⇒ 1/2 1500×20×20=300000J

So, change in kinetic energy = work done=300000−168750=131250J