Two block of masses `M_(1)` and, `M_(2)` are connected with a string which passed over a smooth

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Two block of masses `M_(1)` and, `M_(2)` are connected with a string which passed over a smooth pulley . The mass `M_(1)` is placed on a tough inclined plane as shown in figure .The coefficient of friction between and block and the inclined plane is `mu` what should be the minimum mass `M_(2)` so that the block `M_(1)` slides upwards?
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