$($n$)$ V$-$HINT An electron is a subatomic particle ${10}^{-31}kg)$ that is subject to electric forces. An electron moving in the $+x$ direction accelerates from an inicial velocity of $+5\mathrm{.}40{10}^5\frac{m}{s}$ lo a final velocity of $+2\mathrm{.}10{10}^6\frac{m}{s}$ while traveling a distance of $0\mathrm{.}038$ m $.$ The electron's acceleration is due to two electric forces parallel to the $x$ iaxis: vec$(F{)}_1=+7,50{10}^{-17}N,$ and vec$(F{)}_2,$ which points in the $-x$ direction. Find the magnitudes of $($a$)$ the net force acting on the electron and $($b$)$ the electric force vec$(F{)}_2$