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Problem:

A rock of mass m1 = 0.4 kg is tied to another rock with a mass m2 = 0.58 kg with a string of length L1 = 0.14 m. The rock m2 is tied to another string of length L2 = 0.19 m, and the pair of rocks is swung around in uniform circular motion, making 2 complete revolutions in one second. In this problem, you should neglect gravity and assume the motion is in the horizontal plane.

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a) What is T2, the tension in the string that is connected to the rock with mass m2?

My attempt

I tried taking v = (2*pi*0.33)/.5 seconds = 4.14 m/s

then: T = ((0.58 kg + 0.4 kg)*(4.14 m/s)^2)/0.19 = 88.40 N

but it was wrong...help! thank you!