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Question

Calculate the work required to be done to stop a car of 1500 kg moving at the velocity of 60 km/h?

Solution
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When a object is moving with a constant velocity, it possess K.E
K.E=12×m×v2

So, in order to bring the object to rest i.e its same magnitude of energy is required so, as the final final energy comes to zero.

v=60km/hr=16.66m/s
So, magnitude of work that needs to be done =12×m×v2
Hence, work required to stop the car =12×1500×16.662 =208166.7J=208.17kJ

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