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Block A of mass m rests on the plank B o...

Block A of mass m rests on the plank B of mass 3m which is free to slide on a frictionless horizontal surface. The coefficient of friction between the block and plank is 0.2. If a horizontal force of magnitude 2 mg is applied to the plank B. The acceleration of A relative to the plank is ng/5 where n is.

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