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Statement of a problem № 3211

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A small sphere is attached to a fixed point by a string of length 30 cm and whirls round in a vertical circle under the action of gravity at such a speed that the tension in the string when the sphere is at the lowest point is three times the tension when the sphere is at its highest point. Find the speed of the sphere at the highest point.

Solution:
A small sphere is attached to a fixed point by a string of length 30 cm and whir

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