Answer
$0^{o}$
Work Step by Step
(f)
$\Delta\vec{r}=0$ , as found in part (e).
By convention, a zero vector has a corresponding angle of $0^{o}$.
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 4 - Motion in Two and Three Dimensions - Problems - Page 84: 4f
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