A square of side A (all sides are equal length) has charges +Q and -Q alternating from one corner to the next.

One of the -Q charges in the figure is given an outward "kick" that sends it off with an initial speed v_0 while the other three charges are held at rest.
If the moving charge has a mass m, what is its speed when it is infinitely far from the other charges?
Express your answer in terms of the variables Q, m, v_0, a, and appropriate constants.


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