Problem $13\mathrm{.}016-$ A trailer truck travelling uphill

A trailer truck enters a $2$ percent uphill grade traveling at $\backslash (54\backslash$mathrm$\{$~km$\}/\backslash$mathrm$\{$h$\}\backslash )$ and reaches a speed of $\backslash (108\backslash$mathrm$\{$~km$\}/\backslash$mathrm$\{$h$\}\backslash )$ in $300$ m $.$ The cab has a mass of $\backslash (1,800\backslash$mathrm$\{$~kg$\}\backslash )$ and the trailer $\backslash (5,400\backslash$mathrm$\{$~kg$\}\backslash ).$

Problem $13\mathrm{.}016.$a $-$ Average force at the wheels

Determine the average force at the wheels of the cab. $($Round the final answer to three decimal places.$)$

The average force at the wheels of the cab is kN $.$