Answer
The angle of $\vec{d}_{A}$ is
$$\theta=90^{\circ}.$$
Work Step by Step
The angle of $\vec{d}_{A}$ is
$$\theta=\tan ^{-1}\left(d_{A, y} / d_{A, x}\right)=\tan ^{-1}(\infty)=90^{\circ}.$$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 3 - Vectors - Problems - Page 58: 29b
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