Answer
Choice D.
Work Step by Step
First find the factor $\gamma=\frac{1}{\sqrt{1-u^{2}/c^{2}}}=\frac{1}{\sqrt{1-(180/300)^{2}}}=1.25$.
The relativistic mass is $\gamma m =\gamma (20000kg)=25000 kg $.
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 1253: 37.72
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