A thin, nonconducting rod of length \(L\) lies along the \(x\)-axis with its ends at \(x = 0\) and \(x = L\). The rod carries a total positive charge \(Q\) uniformly distributed along its length. A small particle with mass \(m\) and positive charge \(q\) is released from rest at position \(x = 2L\). As the particle is repelled along the positive \(x\)-axis, what is its speed when it reaches position \(x = 3L\)?