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Question:

What potential difference is needed to stop an electron that has an initial velocity $v = 6.0 \times 10^5 \textrm{ m/s}$?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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$-1.0 \textrm{ V}$