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Blocks A and B mass 5 kg and 3kg are con...

Blocks A and B mass 5 kg and 3kg are connected by a light inextensible string passing under a smooth light pulley C which carries a particle D of mass 4 kg. A and B rest on a horizontal rough surfaces as shown in the diagram. The coefficient of friction is same for both A and B and is just sufficient to prevent A but not B, from moving. Find the coefficient of friction.

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