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Pseudo Force

A block of ma...

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A block of mass m is placed over a plank B of mass 2m. Plank B is placed over a smooth horizontal surface.The coefficient of friction between A and B is μ=0.5.Block A is given a velocity v_†extdegree towards right. Acceleration of B relative to A is (a)g/2 (b)g (c)3g/2 (d)zero ?

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