# Physics

a 4,500 kg roller coaster starts from the top of a 45 m hill with a velocity of 3m/s. The car travels to the bottom through a loop and continues up the next hill. The end of the roller coaster has a level surface that is 4m off the ground. Assume that there is no friction on the roller coaster ride and energy is conserved. How much potential energy will the roller coaster have when it is traveling at 14m/s?

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2. i guess im just not sure where to start

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3. initial PE+initial KE=finalPE+finalKE
you know initial h, and v, so the left side can be calculated.
the right side, you know final KE, solve for PE

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4. i keep getting the incorrect answer.

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