In the given arrangement,all surfaces are smooth. What acceleration $a$ should be given to the system (block $M$) so that the block $m_2$ does not slide down?

  • A
    $\frac{m_2 g}{m_1}$
  • B
    $\frac{m_1 g}{m_2}$
  • C
    $g$
  • D
    $\frac{m_2 g}{m_1+m_2}$

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