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 ]

Question

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 ], 3, 3 .3, 0 .27, 0 .33

MARKS App · Accepted Answer

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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