Problem $3$: An evacuated tube uses a potential difference of $V=0\mathrm{.}44kV$ to accelerate electrons, which then hit a copper plate and produce $x-$rays.

Part $($a$)$ Write an expression for the non$-$relativistic speed of these electrons $v$ in terms of $e,V,$ and $m,$ assuming the electrons start from rest.

Part $($b$)$ Calculate the non$-$relativistic speed of these electrons $v$ in $\frac{m}{s}.$