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A certain string just breaks when it is under 400N of tension. A boy uses this string to whirl a 10kg stone in a horizontal circle of radius 10m. The...

A certain string just breaks when it is under 400N of tension. A boy uses this string to whirl a 10kg stone in a horizontal circle of radius 10m. The boy continuously increases the speed of the stone. At approximately what speed will the string break?

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