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A 50. kg person is riding a roller coaster through the top of a 30. m curve. At what speed must the person be going

A 50. kg person is riding a roller coaster through the top of a 30. m curve. At what speed must the person be going so that they feel weightless through the top of the curve?

A rubber stopper went around a 1.5 m radius circle 35 times in 30 seconds. What is the tangential speed of the rubber stopper?

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