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)