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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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An Intiative by Sri Chaitanya

a

6 seconds

b

5 seconds

c

10 seconds

d

12 seconds

answer is D.

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Detailed Solution

v=u-at ⇒t=ua As v=0 t=u×mF=30×10005000= 6 sec

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