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Identical charged particles: what is the potential energy in the system; if released, what is the speed of each?

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Consider three identical charged particles with charge +Q and mass m. They are held in place at the vertices of an equilateral triangle of side 1.

(a) What is the potential energy of the system?
(b) If they are released from rest, find the speed of each particle when they are far away from each other.

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