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A child has a 58 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 m as shown in the figure below.

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?

A

$0.16\text{ m/s}$

B

$0.26\text{ m/s}$

C

$0.51\text{ m/s}$

D

$2.1\text{ m/s}$

E

$26.1\text{ m/s}$

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