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Q.

An automobile travelling with a speed of 60  km/h,can brake to stop within a distance of 20 m. If the car is going twice as fast, i.e. 120 km/h, the stopping distance will be

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a

20 m

b

40 m

c

60 m

d

80 m

answer is D.

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Detailed Solution

The stopping distance, S∝u2(∵ v2=u2−2as)⇒S2S1=u2u12=120602=4 ⇒S2=4×S1=4×20=80 m
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