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Question

A car moving with speed of 40km/hr can be stopped by applying brakes after at least 2m. If the same car is moving with a speed of 80km/hr what is the minimum stopping distance?

A
2m
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B
4m
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C
6m
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D
8m
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Solution

The correct option is D 8m
Stopping distance s=u22a
s2s1=u22u21s2=[u2u1]2s1s2=(8040)22s2=8m

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