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Question

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

A
5 s
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B
10 s
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C
12 s
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D
6 s
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Solution

The correct option is D 6 s
Given final velocity v=0, initial velocity u=30 m/s
By Newtons equation Ffriction=ma, a=50001000=5 m/s2

From the first equation of motion

v=u+at 0=30+(5)t t=6 s

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