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As the car reduces its speed,its velocitv decreases.Since k.E is directly proportional to the velocity of the body so it goes on decresing and it becomes zero when it comes to a stop.As velocity is zero so K.E is also zero

K.E=1/2 m.v.v

therefore,K.E=!/2 m.0.0=0

But at this moment the potential energy of the car may be maximum.

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