- (II) A child, who is 45 m from the bank of a river, is being carried helplessly downstream by the river's swift current of 1.0 m/s. As the child passes a lifeguard on the river's bank, the lifeguard starts swimming in a straight line (Fig. 3–46) until she reaches the child at a point downstream. If the lifeguard can swim at a speed of 2.0 m/s relative to the water, how long does it take her to reach the child? How far downstream does the lifeguard intercept the child? 1.0 m/s 2.0 m/s - 45 m FIGURE 3-46 Problem 49.

- (II) A child, who is 45 m from the bank of a river, is being carried helplessly downstream by the river's swift current of 1.0 m/s. As the child passes a lifeguard on the river's bank, the lifeguard starts swimming in a straight line (Fig. 3–46) until she reaches the child at a point downstream. If the lifeguard can swim at a speed of 2.0 m/s relative to the water, how long does it take her to reach the child? How far downstream does the lifeguard intercept the child? 1.0 m/s 2.0 m/s - 45 m FIGURE 3-46 Problem 49.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

- (II) A child, who is 45 m from the bank of a river, is being
carried helplessly downstream by the river's swift current
of 1.0 m/s. As the child passes a lifeguard on the river's
bank, the lifeguard starts swimming in a straight line
(Fig. 3–46) until she reaches the child at a point downstream.
If the lifeguard can swim at a speed of 2.0 m/s relative
to the water, how long does it take her to reach the child?
How far downstream does the lifeguard intercept the
child?
1.0 m/s
2.0 m/s
- 45 m
FIGURE 3-46 Problem 49.

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