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A student with a mass of m=60kg rides a roller coaster with a loop with a...

A student with a mass of m=60kg rides a roller coaster with a loop with a radius of curvature of r=6.0meters. What is the minimum speed the roller coaster can maintain and still make it all the way around the loop? (Other answers for similar problems solve using the law of conservation of energy. However, we have not learned that in our course yet, and have only reviewed uniform circular motion. Is there another way to solve this equation? does the minimum speed occur when normal force is zero since normal force and weight are both in the downward direction at the top of the loop?)

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