Current Attempt in Progress

A roller coaster $(432$ kg $)$ moves from above the ground$)$ to above the ground$).$ Two non$-$conservative forces are present: friction does $-1\mathrm{.}42{10}^{4}J$ of work on the car, and a chain mechanism does $+5\mathrm{.}85{10}^{4}J$ of work to help the car up a long climb. What is the change in the car's kinetic energy $K{E}_f-K{E}_0$ from $A$ to $B?$

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Attempts: $0$ of $3$ used