Two block of masses `M_(1) and M_(2)` are connected with a string passing over a pulley as shown in

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Two block of masses `M_(1) and M_(2)` are connected with a string passing over a pulley as shown in figure The block `M_(1)` lies on a horizontal surface friction between the block `M_(1)` and the horizontal surface is `mu` The system accelerates. What additional mass `m` should be plased on the block `M_(1)` so that the system does not accelerate ?
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