After head on elastic collision between two balls  of equal masses , one is observed to have a speed of  $3\,\,m/s$  along positive  $x-$ axis and the other has a speed of  $2\,\,m/s$  along negative $x$  axis. The original velocities of the balls are

  • A

    $-2\,\,m/s\,\,$ and $\,\,+3\,\,m/s$

  • B

    $+2\,\,m/s\,\,$ and $\,\,+3\,\,m/s$

  • C

    $-3\,\,m/s\,\,$ and $\,\,+2\,\,m/s$

  • D

    $+3\,\,m/s\,\,$ and $\,\,-2\,\,m/s$

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