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A block of mass'm' it kept over the smoo...

A block of mass'm' it kept over the smooth surface of the plank of mass M. the plank of length l is kept over the smooth horizontal surface. A constant horizontal force F is applied onto the plank as shown in figure. Calculate the time after which the block falls off the plank?

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For bigger block `l=(1)/(2)xx(F)/(M)t^(2)rArrt=sqrt((2lM)/(F))`
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