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Question

Starting from rest, the time taken by a body sliding down on a rough inclined plane at 45 with the horizontal is, twice the time taken to travel on a smooth plane of same inclination and same distance. Then the coefficient of kinetic friction is

A
0.25
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B
0.33
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C
0.50
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D
0.75
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Solution

The correct option is D 0.75
μ=tanθ(11n2)
Here, θ=45 and n=2
μ=tan45(1122)
=114=34=0.75

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