Answer
The period is about 90 minutes.
Work Step by Step
This is stated on page 192.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 10 - Reading Check Questions (Comprehension) - Page 201: 14
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