Balancing forces application

A plank of mass 2 kg2 \text{ kg} and length 1 m1 \text{ m} is placed on a horizontal floor. A small block of mass 1 kg1 \text{ kg} is placed on top of the plank, at its right extreme end. The coefficient of friction between plank and floor is 0.50.5 and that between plank and block is 0.20.2. If a horizontal force =30 N=30 \text{ N} starts acting on the plank to the right, the time after which the block will fall off the plank is

Take g=10 m/s2g=10 \text{ m/s}^{2}

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