$A$ block of mass $M$ is placed on $a$ horizontal surface and it is tied with an inextensible string to $a$ block of mass, as shown in figure. A block of mass $m_0$ is also placed on $M$ The minimum value of $\mu$ between the block $M$ and $m_0$ (taking horizontal surface frictionless) for which all the three blocks move together, is
A$\frac{m}{{m + {m_0} + M}}$
B$\frac{m}{{m + M}}$
C$\frac{{{m_0}}}{{m + {m_0} + M}}$
D
none of these.
Diffcult
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A$\frac{m}{{m + {m_0} + M}}$
a
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