Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 35 - Think and Explain - Page 684-685: 68

Answer

Your friend also sees your watch running slowly, by an identical factor.

Work Step by Step

From your friend's perspective, she is at rest and you are the fast-moving person. She observes identical time dilation effects.
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