The spacecraft of mass $M$ moves with velocity $V$ in free space at first, then it explodes breaking  into two pieces. If after explosion a piece of mass $m$ comes to rest, the other piece of space craft will have a velocity

  • A

    $MV/(M -m)$

  • B

    $MV/(M + m)$

  • C

    $mV/(M -m)$

  • D

    $mV/(M + m)$

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