A roller coaster $(474$ kg $)$ moves from above the ground$)$ to $B(27\mathrm{.}0$ m above the ground$).$ Two non$-$conservative forces are present: friction does $-2\mathrm{.}85{10}^{4}J$ of work on the car, and a chain mechanism does $+4\mathrm{.}60{10}^{4}J$ of work to help the car up a long climb. What is the change in the car's kinetic energy $K{E}_f-K{E}_o$ from $A$ to $B?$