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A child has a $58\ \text{g}$ tennis ball attached to a string of negligible mass ​and is swinging it around in a vertical circle, with a radius of $0.45\ \text{m}$ as shown in the figure below.

John Krehbiel. Created for Copyright 2016. All rights reserved.

If the ball just barely makes it through a smooth circle at the top of the circle, what is the speed of the ball at the top?


$0.16\text{ m/s}$


$0.51\text{ m/s}$


$2.1\text{ m/s}$


$26.1\text{ m/s}$

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