An electron of mass $m$ and charge $e$ is accelerated from rest through a potential difference $V$ i

Question

An electron of mass $m$ and charge $e$ is accelerated from rest through a potential difference $V$ in vacuum. Its final velocity will be

Professor PC Thomas Classes · Answer

Conservation of energy: $eV = \frac{1}{2}mv^2 \Rightarrow v = \sqrt{\frac{2eV}{m}}$.