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The coefficient of friction between bloc...

The coefficient of friction between block `A` of mass `m_(1)=5kg` and block `B` of mass `m_(2)=10 kg ` is `mu_(2)=0.5` . There is no friction froce between block `B` and fixed horizontal surface. A force of `300N` acts on block `B` in horizontal direction and a horizontal force of magnitude `F` acts on block `A` as shown , both towards right. Initially there is no relative motion between the blocks. The minimum value of `F` such that relative motion starts between `A` and `B` is `:`

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