An electron is accelerated across a potential difference of $5.0 \times 10^{3} \rm{v}$ in the CRT of a television. What is the velocity of the electron if it starts from rest?

$4.193\times 10^7\mathrm{~ms}^{-1}$

$4.253\times 10^7\mathrm{~ms}^{-1}$

$5.351\times 10^7\mathrm{~ms}^{-1}$

$4.112\times 10^7\mathrm{~ms}^{-1}$