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Misconception NGM045:

Hills are speed booster, which means that the speed of a ball after rolling over a hill is greater than the speed of the ball before reaching the hill (Duit, 1981).

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Assuming no energy transfer between a roller coaster car and the track it is moving in or between the car and the air around it, all of the hills that a roller coaster car can get over must be lower than the height of the starting point.