Inside a radiation therapy device, an electron is in the presence of a uniform electric field with a magnitude of $309$ N$/$C$.$

$($a$)$

What is the magnitude of the acceleration of the electron $($in m$/$s$2)?$

m$/$s$2$

$($b$)$

The electron is initially at rest. What is its speed $($in m$/$s$)$ after $9\mathrm{.}00109$ s$?$

m$/$s