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Question: 

The kinetic energy of a particle is 45 MeV. If the momentum is 121 MeV/c, what is the particle’s mass?

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: 

$140 \textrm{ MeV/c}^2$

Giancoli 7th Edition, Chapter 26, Problem 38

(1:47)

Chapter 26, Problem 38 is solved.

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