The motion of an electron

A voltage of  V is applied between two vertical metal plates that are $d=$ cm apart. At time $t=0$ s, an electron is halfway between the two plates and has zero velocity. At what time $t_s$ will the electron strike one of the plates? How far $\delta x$ has the electron fallen due to gravity in this time?

$t_s = $ [s] $\delta x = $ [m]