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Homework Statement
A 2.0 kg ball is attached to a vertical post with two strings, one 2.0 m long and the other 1.0 m long as shown in the figure. If the ball is set whirling in a horizontal circle, what is the minimum speed necessary for the lower string to be taught? If the ball has a constant speed of 6 ms1, find the tension on each string.
\
 \
 \ 2.0m
 \
 \
0 2.0kg

 ^1m
The Attempt at a Solution
I don't exactly understand what this means, I've tried tackling it several ways.
Only thing I can figure is that when the string is taught it is at maximum centripetal force. However I'm not sure how to find this.
I have so far
F(centripetal)=mv^2/r
F=2v^2/1
F=2v^2