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Question: 

Determine the speed and the momentum of an electron (m = $9.11 \times 10^{-31} \textrm{ kg}$) whose KE equals its rest energy.

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. $0.866c$
  2. $0.885 \textrm{ MeV/c}$

Giancoli 7th Edition, Chapter 26, Problem 31

(1:53)

Chapter 26, Problem 31 is solved.

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