A 2.6 mm -diameter sphere is charged to -4.5 nC . An electron fired directly at the sphere from far away comes to within 0.37 mm of the surface of the target before being reflected. Part A What was the electron's initial speed

Explanation:

Given

Diameter of sphere is

Charge on the sphere is

Nearest distance electron can reach to sphere is

Here, kinetic energy of electron is converted into electrostatic energy between the two i.e.

Thus, the initial speed of electron is .

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i think the answer is a and b

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