# Classic Mechanics

Classical Mechanics Level pending

A block of mass $$m$$ is kept over another block of mass $$M$$ and the system rests on a horizontal surface as shown in the figure. A constant horizontal force $$F$$ acting on the lower block produces an acceleration of $$\frac F2(m+M)$$ in the system, the 2 blocks always move together. Find the coefficient of kinetic friction b/w the bigger block and horizontal surface.

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