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Q.

A car having a mass of 1000 kg is moving at a speed of 30 metres/sec. Brakes are applied to bring the car to rest. If the frictional force between the tyres and the road surface is 5000 newtons, the car will come to rest in

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a

5 seconds

b

10 seconds

c

12 seconds

d

6 seconds

answer is D.

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Detailed Solution

$v = u - at \Rightarrow t = \frac{u}{a} [As v = 0] t = \frac{u \times m}{F} = \frac{30 \times 1000}{5000} = 6 \sec$

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