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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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Quick Answer: 

$-1.0 \textrm{ V}$

Giancoli 7th Edition, Chapter 17, Problem 3