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Q.

Starting from rest, the time taken by a body sliding down on a rough inclined plane at 450 with the horizontal is twice the time taken to travel on a smooth plane of the same inclination and same distance. Then, the coefficient of kinetic friction is

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a

0.75

b

0.25

c

0.50

d

0.33

answer is D.

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Detailed Solution

Coefficient of kinetic friction, μ=tanθ[1–1/n2]

here θ=450 and n=2

μ=tan 450[1–1/22]=1–¼ =3/4=0.75

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