Three particles each of mass $m$ are located at the vertices of an equilateral triangle $ABC$. They start moving with equal speeds $v$ each along the medians of the triangle and collide at its centroid $G$. If after collision, $A$ comes to rest and $B$ retraces its path along $GB,$ then $C$

  • A

    also comes to rest

  • B

    moves with a speed $v$ along $CG$

  • C

    moves with a speed $v$ along $BG$

  • D

    moves with a speed along $AG$

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