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A tennis ball connected to a string is spun around in a vertical, circular path at...

A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.15 kg and moves at v = 4.89 m/s. The circular path has a radius of R = 0.94 m

What is the minimum velocity so the string will not go slack as the ball moves around the circle?

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