As the distance between the two spheres approaches infinity, the electrostatic force approaches infinity.
You may want to reference (Pages 165 - 166) Section 5.1 while completing this problem.
Two positively charged spheres, each with a charge of 2.1 × 10−5 C, with a mass of 1.0 kg, and separated by a distance of 1.6 cm, are held in place on a frictionless track. What speed will each sphere attain as the distance between the spheres approaches infinity?
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