Answer
$\theta=45°$ or $\theta=225°$
Work Step by Step
$\theta=tan^{-1}(\frac{A_y}{A_x})$. If $A_x=-A_y\ne0$:
$\theta=tan^{-1}(\frac{A_y}{-A_y})=tan^{-1}(-1)=45°$.
Or $\theta=45°+180°=225°$
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 3 - Vectors in Physics - Conceptual Questions - Page 76: 11
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