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Two blocks of masses m(1) and m(2) are p...

Two blocks of masses `m_(1)` and `m_(2)` are placed in contact with each other on a horizontal platform as shown in figure The coefficent of friction between `m_(1)` and platform is `2mu` and that between block `m_(2)` and platform is `mu`.The platform moves with an acceleration `a` . The normal reation between the blocks is

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