Calculate the potential energy of a system of two small spheres, one carrying a charge of 3.20 μCμC and the other a charge of -2.50 μCμC , with their centers separated by a distance of 0.180 mm . Assume that UU = 0 when the charges are infinitely separated.Suppose that one sphere is held in place; the other sphere, with mass 1.80 gg , is shot away from it. What minimum initial speed would the moving sphere need to escape completely from the attraction of the fixed sphere?

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