An electron is accelerated inside a parallel plate capacitor. The electron leaves the negative plate with a negligible initial velocity and then after the acceleration it hits the positive plate with a final velocity $.$ The distance between the plates is $15\mathrm{.}0$ cm$,$ and the voltage difference is $145$ kV$.$ Determine the final velocity of the electron using classical mechanics. $($The rest mass of the electron is $9\mathrm{.}1110-31$ kg$,$ the rest energy of the electron is $511$ keV.$)$

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What is the final velocity of the electron if you use relativistic mechanics?