E GO Two horizontal forces, vec$(F{)}_1$ and vec$(F{)}_2,$ are acting on a box, but only vec$(F{)}_1$ is shown in the drawing. vec$(F{)}_2$ can point either to the right or to the left. The box moves only along the $x$ axis. There is no friction between the box and the surface. Suppose that vec$(F{)}_1=+9\mathrm{.}0N$ and the mass of the box is $3\mathrm{.}0$ kg $.$ Find the magnitude and direction of vec$(F{)}_2$ when the acceleration of the box is $($a$)+5\mathrm{.}0\frac{m}{s^2},($b$)-5\mathrm{.}0\frac{m}{s^2},$ and $($c$)0\frac{m}{s^2}.$