A mass $m$ hangs with the help of a string wrapped around a pulley on a firctionless  bearing. The pulley has mass $m$ and radius $R$. Assuming pulley to be a perfect  uniform circular disc, the acceleration of the mass $m$, if the string does not slip on the  pulley, is:-

  • A

    $\frac{2}{3} g$

  • B

    $\frac{g}{3}$

  • C

    $\frac{3}{2} g$

  • D

    $g$

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