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Question
Do Exercise 3.16 again using analytical techniques and change the second leg of the walk to straight south. (This is equivalent to subtracting B from A—that is, finding R' = A - B) (b) Repeat again, but now you first walk 25.0 m north and then 18.0 m east. (This is equivalent to subtract A from B — that is, to find R'' = B - A. Is that consistent with your result?)

a) $R' = 30.8 \textrm{ m, } 54.2^\circ \textrm{ S of W}$

b) $R'' = 30.8 \textrm{ m, } 54.2^\circ \textrm{ N of E}$

Solution Video

# OpenStax College Physics Solution, Chapter 3, Problem 19 (Problems & Exercises) (5:17)

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Video Transcript

Submitted by Lal21 on Sat, 08/24/2019 - 21:29

Both a) and b) should be 30.8m as seen in the video.

Submitted by coltonwhittaker on Tue, 02/02/2021 - 18:11

tan-1(25/18) does not come out to 54.2 degrees your wrong

Submitted by ShaunDychko on Wed, 02/03/2021 - 10:36

Hi coltonwhittaker, thank you for the comment. Did your calculator give 0.947? That would be answer in radians. The calculator needs to be in degree mode to get $54.2^\circ$.
All the best,
Shaun