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A 2 5 mm -diameter sphere is charged to -4

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A 2 5 mm -diameter sphere is charged to -4.6 nC . An electron fired directly at the sphere from far away comes to within 0.39 mm of the surface of the target before being reflected. PART A: What was the electron's initial speed? PART B: At what distance from the surface of the sphere is the electron's speed half of its initial value? PART C: What is the acceleration of the electron at its turning point?