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Q.

A car moving with a speed of20ms1 can be stopped by applying brakes, after travelling a distance of 2 m. The retardation of the car is                     

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a

50ms2

b

200ms2

c

150ms2

d

100ms2

answer is B.

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Detailed Solution

Initial velocityu=20m/s , Final velocityv=0m/s , Distance travelled s = 2m, a = ?

We know v2u2=2as

a=v2u22s=04002×2=100m/s2

Retardation(a)=100m/s2

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A car moving with a speed of20 ms−1 can be stopped by applying brakes, after travelling a distance of 2 m. The retardation of the car is