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 ?
  • A$\mu g$
  • B$g/\mu $
  • C${\mu ^2}/g$
  • D$g/{\mu ^2}$
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