Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 3 - Kinematics in Two Dimensions; Vectors - Problems: 49

Answer

23s; 23m

Work Step by Step

The lifeguard is carried downstream at the same rate as the child. We only need to deal with the horizontal motion to find the time. t = (45 m)(2.0 m/s) = 22.5 s. The lifeguard will reach the child in approximately 23 seconds. The river carries both of them downstream a distance of (1.0 m/s)(22.5 s) = 22.5 m. The lifeguard will intercept the child at approximately 23 meters downstream.
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