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How fast can the ball?

A certain cord will break if its tension exceeds 250 N. Suppose the cord is attached to a 0.50 kg ball. If the ball is swung in a horizontal circle at the end of a 0.80 m cord, how fast can the ball move before the cord breaks?
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1 Answer

 
T = mv^2/r
Plug in the maximum tension force to get the fastest speed of the ball.
250 = 0.50(v^2)/0.80
Solve for v,
v = sqrt(400) = 20 m/s <==Answer