A roller coaster $(402$ kg $)$ moves from A $(9\mathrm{.}31$ m above the ground$)$ to B $(26\mathrm{.}4$ m above the ground$).$ Two non$-$conservative forces are present: friction does $-2\mathrm{.}39{10}^{4}J$ of work on the car, and a chain mechanism does $+6\mathrm{.}00{10}^{4}J$ of work to help the car up a long

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