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Defying gravity: The uphill roller

There is a precise article in the European Physics Journal by S. Gandhi and C. Efthimiou about the uphill roller. The reference is: "The Ascending double cone: a closer look at a familiar demonstration", volume 26 in 2005, pages 681-694. The authors have looked at several details (some of which I do not understand since I am still in high school).

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