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4. A block A of mass 2 kg rests on another block Bof mass 8kg which rests on horizontal floor. Thecoefficient of friction between A and Bis 0.2 whilethat between B and floor is 0.5. When a horizon-tal force of 25 N is applied on the block B, theforce of friction between A and B is(BHU 2004](d) 4.9 N(a) Zero(b) 3 9 N(c) 5.0N |
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