Answer
$-1$
Work Step by Step
The dot product of two vectors pointing in opposite directions is negative. Since the magnitude of the unit vector, $\hat{j}$, is 1, the dot product is $-1$.
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 61: 67c
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