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Q.

When a car of mass 1200 kg is moving with a velocity of 15 ms-1 on a rough horizontal road, its engine is switched off. How far does the car travel before it comes to rest if the coefficient of kinetic friction between the road and tyres of the car is 0.5 ? (g=10 ms-2)

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a

23.5m

b

25m

c

22.5m

d

21.6m

answer is D.

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Detailed Solution

a=μg

From v2=u2-2as
⇒ s = 225/10 = 22.5m

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