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Q.

A car, moving with a speed of 50km/hr, can be stopped by brakes after at least 6m. If the same car is moving at a speed of 100km/hr. the minimum stopping distance is

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a

12 m

b

18 m

c

6 m

d

24 m

answer is C.

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Detailed Solution

using the equation 

v2=u2+2as

here v=0 as the body stops finally

u2=-2as

s=-u22a

assuming retardation a is constant

s∝u2

s1s2=u12u22

6s2=5021002=14

s2=24 m

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