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Question

Two cars A and B have masses mA and mB respectively, with mA>mB. Both the cars are moving in the same direction with equal kinetic energy. If equal braking force is applied on both, then before coming to rest.

A
A will cover a greater distance
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B
B will cover a greater distance
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C
Both will cover the same distance
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D
Distance covered by them will depend on their respective velocities
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Solution

The correct option is B B will cover a greater distance
Kinetic energy K=12mv2
Since, mA>mB and both the cars move with same kinetic energy,
vA<vB
Also, both the car with retard with same acceleration because of equal braking force before coming to rest.
So, car B will cover a greater distance than car A.

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