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A string under a tension of 59N is used to whirl a rock in a horizontal circle of radius 3.9 m at a speed of 23.9 m/s. The string is pulled in and the speed of the rock increases. When the string is 0.482 m long and the speed of the rock is 53 m/s, the string breaks. What is the breaking strength (in newtons) of the string?

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