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Pseudo Force

A long plank ...

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A long plank begins to move at t = 0 and accelerates with a speed given by v = (2t^2 + 2) m/s^{-1}. A small block initially at rest on the plank begins to slip at t is equal to (Coefficient of friction between block and plank has μ_s= 0.4 and μ_k = 0.3) (Take g = 10 m/s^2)

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