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A roller coaster starts from a height of 30.0 m and runs down a slope, then through a loop. If it takes a minimum speed

A roller coaster starts from a height of 30.0 m and runs down a slope, then through a loop. If it takes a minimum speed of 15 m/s when passing the top of the loop to safely keep all the passengers in place, what is the maximum height of the loop?

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