Answer
$\Delta t$ will be positive
Work Step by Step
The temporal separation, $\Delta t$, will always be positive. It may be different for different reference frames, but will still always be positive.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 37 - Relativity - Questions - Page 1144: 2b
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