Broken String and Speeding Charges

Three identical point charges, each with mass \(m=1~\text{g}\), are connected by strings of the same length \(l\) so that they form an equilateral triangle ABC. Initially, the charges are at rest and the electrostatic potential energy of the system is \(U_{0}=1~\text{J}\). Suddenly, the string connecting the charges at A and B snaps. What will be the maximum speed in meters per second of the charge located at C.

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