A truck and a car moving with the same kinetic energy are brought to rest by the application of brakes which provides equal retarding forces. Which of them will come to rest in a shorter distance?

The truck

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The car

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Both will travel the same distance before coming to rest

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Cannot be predicted

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Solution

The correct option is C Both will travel the same distance before coming to rest
Work done $= F o r c e \times d i s t a n c e =$ Change in kinetic energy. Both the truck and the car had same kinetic energy and hence same amount of work is needed to be done. As retarding force applied is same for both, therefore, both the truck and the car travel the same distance before coming to rest.

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