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A 45.7-kg boy on a swing moves in a circular arc of radius 3.80 m.At the lowest position, the child's speed reaches 2.78 m/s. Determine the magnitude of the tension in each of the two vertical support chains.

i used mv^2/r, but i keep getting the answer wrong. the answer is suppose to be 270 m/s

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Doh! so easy

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