A balloon of mass $m$ is descending down with an acceleration $\frac{g}{2}$.  How much mass should be removed from it so that it starts moving up with same acceleration?

  • A

    $\frac{{2\,m}}{3}$

  • B

    $\frac{{m}}{3}$

  • C

    $3\,m$

  • D

    $\frac{4}{3}\,m$

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