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NTA Abhyas JEE Main2020PhysicsLaws of MotionPractice

A block starts moving up a fixed inclined plane of inclination 60 ∘ with a velocity of 20   ms - 1 and stops after 2 s . The approximate value of the coefficient of friction is [ g = 10   ms - 2 ]

Options

  1. A3
  2. B3 .3
  3. C0 .27
  4. D0 .33

Correct answer

C. 0 .27

Step-by-step solution

Retardation of the block is a = g sin θ + μ cos θ = 5 3 + μ v = u - a t = 0 ⇒ a = u t ⇒ 5 3 + μ = 20 2 ⇒ μ = 0 . 27

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