Two particles $A$ and $B$ initially at rest move towards each other under a mutual force of attraction. At the instant when the speed of $A$ is $v$ and the speed of $B$ is $2v$, the speed of centre of mass of the system is

  • A

    $Zero$

  • B

    $v$

  • C

    $1.5\ v$

  • D

    $3\ v$

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