A roller coaster $(427$ kg $)$ moves from above the ground$)$ to above the ground$).$ Two nonconservative forces are present: friction does $-2\mathrm{.}24{10}^{4}J$ of work on the car, and a chain mechanism does $+4\mathrm{.}12{10}^{4}J$ 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 $B?$

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