Ball $P$ of mass $m$ moving with velocity $v$ collides with another ball $Q$ of mass $2m$, which is at rest. If $v_P$ and $v_Q$ are the final velocities of $P$ and $Q$ respectively after the collision, then (Assume the coefficient of restitution is $e = 1/3$):
- A$\frac{v_Q}{v_P} = 4$
- B$\frac{v_P}{v_Q} = 4$
- C$\frac{v_Q}{v_P} = 2$
- D$\frac{v_P}{v_Q} = 2$
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