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A block of mass 1 kg is placed over a pl...

A block of mass 1 kg is placed over a plank of mass 2 kg. The length of the plank is 2m. Coefficient of friction between the block and the plank is 0.5 and the ground over which plank is placed is smooth. A constant force F = 30 N is applied on the plank is horizontal direction. The time after which the block will separate from the plank is `73xx10^(-x)S` the value of x is : `(g = 10 m//s^(2))`

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