JEE Main 2006 — Electrostatics Question with Solution

Two insulating plates are both uniformly charged in such a way that the potential difference between them is $$V_2-V_1=20V.$$ (i.e., plate $$2$$ is at a higher potential). The plates are separated by $$d=0.1$$ $$m$$ and can be treated as infinitely large. An electron is released from rest on the inner surface of plate $$1.$$ What is its speed when it hits plate $$2$$?
$$\left(e=1.6\times {10}^{-19}C,m_e=9.11\times {10}^{-31}kg\right)$$