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Q.

A block starts moving up a fixed inclined plane of inclination 60°  with a velocity of 20 m/s and stops after 2 sec. The approximate value of coefficient of friction is  g=10 m/s2

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a

0.27

b

3.3

c

3

d

0.33

answer is C.

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Detailed Solution

Retardation =gsinθ+μcosθ=53+μ
Now v=u−at
∴a=ut as v=0
∴53+μ=10
⇒μ=0.27

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