Three blocks $A$, $B$ and $C$ of equal mass $m$ are placed on a smooth surface as shown. Coefficient of friction between any block $A, B$ and $C$ is $μ$. The maximum value of mass $D$ so the block $A, B$ & $C$ move without slipping over each other is
  • A$\frac{{3m\mu }}{{\mu \, + \,1}}$
  • B$\frac{{3m(1 - \mu )}}{{\mu \,}}$
  • C$\frac{{3m(1 + \mu )}}{{\mu \,}}$
  • D$\frac{{3m\mu }}{{(1 \, - \,\mu)}}$
Diffcult
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