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 $V_2-V_1=20\mathrm{V}$. (i.e. plate 2 is at a higher potential). The plates are separated by $d=0.1\mathrm{m}$ 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 $2?$ $\left(\mathrm{e}=1.6\times 10^{-19}\mathrm{C},{\mathrm{m}}_{\mathrm{e}}=9.11\times 10^{-31}\mathrm{kg}\right)$