Question

a 17kg mass is being swung on a rope in circular motion on a vertical plane. if the rope is 23 m long, what is the tension in the rope at the bottom of its path if its speed there is 13m/s.

i tried solving this by doing: T = 17*(13^2/23) = 124.9 N which was incorrect The correct answer is 290N, need help figuring out how to get the correct answer!