Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 8 - P.S. Problem Solving - Page 626: 10c


$|s|=126.49~miles~per~hour$ It is the total speed of the skydiver.

Work Step by Step

$|s|=\sqrt {s\cdot s}=\sqrt {(40i-120j)(40i-120j)}=\sqrt {1600+14400}=\sqrt {16000}=40\sqrt {10}\approx126.49$
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