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A 50.0 g ball swings in a vertical circle at the end of a string of...

A 50.0 g ball swings in a vertical circle at the end of a string of length 39.8 cm. If the speed of the ball at the bottom is 5.11 m/s, what is the speed of the ball at the top?

B) Find the work done by gravity on the ball as it goes from bottom to top.

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