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As part of the ride, a roller coaster crests a hill that can be approximated as...

As part of the ride, a roller coaster crests a hill that can be approximated as a circle with a radius of 30.0 meters. How fast would the coaster need to be traveling at the top of the hill if the safety harness in the car needed to exert a force that held a 80.0-kg rider down and had a magnitude of 250 N?

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