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A plank of mass 2 kg and length 1 m is p...

A plank of mass `2 kg` and length `1 m` is placed on horizontal floor.A small block of mass `1 kg` is placed on top of the plank , at its right extreme end .The coefficient of friction between plank and floor is `0.5` and that between plank and block is `0.2` . If a horizontal force `= 30 N` starts acting on the plank to the right ,the time after which the block will fall off the plank is `(g = 10 ms^(-2))`

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