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## Homework Statement

IP One of the - charges in the figure (sqaure, with one charge at each corner) is given an outward "kick" that sends it off with an initial speed while the other three charges are held at rest. If the moving charge has a mass , what is its speed when it is infinitely far from the other charges?

Express your answer in terms of the variables (Q (charge), m, v and a (a is the length of the side of one sqaure)) and appropriate constants.

Im not sure how to start. Can anyone help?