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Question: 

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

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$-1.0 \textrm{ V}$

Giancoli 7th Edition, Chapter 17, Problem 3

(1:23)