$5.$ As shown, a person pulls a trunk up a rough loading ramp of a mover's truck with a force of magnitude $\backslash ($ F$=90\backslash$mathrm$\{$~N$\}\backslash ).$ The trunk moves up the incline at a constant acceleration of $\backslash (0\mathrm{.}50\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}^\{2\}\backslash ),$ and the force of kinetic friction between the ramp and trunk is $10$ N $.$ What is the mass of the trunk?

A$.45$ kg

B$.11$ kg

C$.23$ kg

D$.9\mathrm{.}0$ kg

E$.18$ kg