two rolling balls

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This problem was suggested by Toby Crisford.


Two balls of equal radius and mass, free to roll on a horizontal plane, are separated by a distance L large compared to their radius. One ball is solid, the other hollow, and they are attracted by a mysterious force. How far will the solid ball roll before it collides with the hollow ball?

Answer


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Michael A. Gottlieb  (html, 3k)

 

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