Answer
$|s|=126.49~miles~per~hour$
It is the total speed of the skydiver.
Work Step by Step
$|s|=\sqrt {s\cdot s}=\sqrt {(40i-120j)(40i-120j)}=\sqrt {1600+14400}=\sqrt {16000}=40\sqrt {10}\approx126.49$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 8 - P.S. Problem Solving - Page 626: 10c
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