$A$ block of mass $m_1$ rests on a horizontal table. $A$ string tied to the block is passed over a frictionless pulley fixed at the end of the table,and to the other end of the string is hung another block of mass $m_2$. The acceleration of the system is

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

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