Скачать или смотреть A roller coaster car, starting from rest at the top of a hill, goes down to the bottom of the hill …

A roller coaster car, starting from rest at the top of a hill, goes down to the bottom of the hill at ground level and then up around the inside edge of a vertical loop with a radius of 15 m. What is the minimum height h of the hill above the ground required to keep the car on the track when it is upside down at the top of the loop? I know V needs to be calculated through the centripetal force equation, then the work-energy theorem must be used, but I am not too sure what to do from there. A thorough explanation would be great.

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