$A$ ball of mass $m$ moving with velocity $v$ undergoes an elastic collision with another ball of the same mass $m$ moving in the opposite direction with velocity $2v$. What will be their velocities after the collision?

  • A
    $-v, 2v$
  • B
    $-2v, v$
  • C
    $v, -2v$
  • D
    $2v, -v$

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