A block of mass $m$ is placed on the top of another block of mass $M$ as shown in the figure. The coefficient of friction between them is $\mu $. What is the maximum acceleration with which the block $M$ may move so that m also moves along with it ?
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${a_{\max }} = \frac{{{F_{ \max }}}}{m} = \frac{{\mu mg}}{m} = \mu g$
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