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explain how a roller coaster functions using gravity and momentum. Why does it not need an engine or a motor to speed it up and slow it down?

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Answer:

A roller coaster does not have an engine to generate energy. This builds up a supply of potential energy that will be used to go down the hill as the train is pulled by gravity. Then all of that stored energy is released as kinetic energy which is what will get the train to go up the next hill.

Explanation: