Cathode$-$ray tubes $($CRTs$)$ are often found in oscilloscopes and computer monitors. In the figure $($Figure $1)$an electron with an initial speed of $6\mathrm{.}60\backslash$times $106$ m$/$s

is projected along the axis midway between the deflection plates of a cathode$-$ray tube. The potential difference between the two plates is $18\mathrm{.}0$ V and the lower plate is the one at higher potential. Part E$.$ How far below the axis has the electron moved when it reaches the end of the plates? Part G$.$ How far below the axis will it strike the flurescent screen S$?$