A Pair of Parallel Conducting Plates Have Potentials Of $-17 \mathrm{~V}$

A pair of parallel conducting plates have potentials of $-17 \mathrm{~V}$ and $55 \mathrm{~V}$ , respectively. An electron is ejected from the plate at potential $-17 \mathrm{~V}$ and travels to the plate at $55 \mathrm{~V}$ . What is the speed of the electron as it strikes the $55 \mathrm{~V}$ plate, assuming it left the $-17 \mathrm{~V}$ plate starting from rest? The mass of the electron is $9.11 \times$ $10^{-31} \mathrm{~kg}$ .

A) $3.6 \times 10^{6} \mathrm{~m} / \mathrm{s}$
B) $2.2 \times 10^{6} \mathrm{~m} / \mathrm{s}$ .
C) $3.1 \times 10^{6} \mathrm{~m} / \mathrm{s}$
D) $5.0 \times 10^{6}\mathrm{~m} / \mathrm{s}$