Answer
It is a proton.
Work Step by Step
Use the relativistic formula for momentum, $p=\frac{mv}{\sqrt{1-v^2/c^2}}$.
Solve for $m=\frac{p\sqrt{1-v^2/c^2}}{v}=1.67\times10^{-27}kg$.
A positively charged particle with this mass must be a proton.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 37 - Relativity - Problems - Exercises - Page 1250: 37.54
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