Two identical blocks each of mass $M$ are attached to the ends of a massless inextensible string which passes over a pulley with a fixed axis as shown below. $A$ small mass $m$ is now placed on block $B$ (the right block). The acceleration with which the two blocks move together is ($g =$ gravitational acceleration).
- A$\frac{mg}{2M+m}$
- B$\frac{Mg}{M+2m}$
- C$\frac{Mg}{2M+m}$
- D$\frac{mg}{M+2m}$
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