Question: I need help understanding the following problem: If an electron travels 0.260 m from an electron gun to a TV screen in 40.5 ns, what

I need help understanding the following problem:

If an electron travels 0.260 m from an electron gun to a TV screen in 40.5 ns, what voltage was used to accelerate it? (Note that the voltage you obtain here is lower than actually used in TVs to avoid the necessity of relativistic corrections.)

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