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53. Two blocks A and B of masses 5 kg and 3 kgrespectively rest on a smooth horizontal surfacewith B over A. The coefficient of friction between Aand B is 0.5. The maximum horizontal force(in kg wt.) that can be applied to A, so that therewill be motion of A and B without relative slipping, is2(2) 2.5(3) 4(4) 5

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