A roller coaster is just barely moving as it goes over the top of the hill. It

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A roller coaster is just barely moving as it goes over the top of the hill. It rolls nearly without friction down the hill and then up over a lower hill that has a radius of curvature of 15 m. How much higher must the first hill be than the second if the passengers are to exert no forces on their seats as they pass over the top of the lower hill?

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