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Two blocks A and B of masses m=10kg and ...

Two blocks `A` and `B` of masses `m=10kg` and `M=20kg` respectively are planed on each other and their combination rests on a fixed horizontal surface `C` . A light string passing over the smooth light pulley is used to contact `A` and `B` as shown. The coefficient of sliding friction between all surface in contact is `mu=(1)/(4)` . if `A` is dragged with a force `F` then for both `A` and `B` to move with a uniform speed we have.

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