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Question

A car starts from rest to cover distance s. The coefficient of kinetic friction between the road and tire is μ. The minimum time in which the car cover the distance s is proportional to

A
μ
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B
μ
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C
1μ
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D
1μ
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Solution

The correct option is D 1μ
From FBD,
ma=f=μN
=μmg
a=μg
by using S=ut+12at2, we will get,
s=0+12μgt2
t2=2sgμ
t1μ

172168_137048_ans_a7f90f35981d4c7b8a1d5660884041a1.png

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