Answer
Up
Work Step by Step
Use the right hand rule with your fingers extended north and your palm facing west. Your thumb points in the direction of the cross product, which is upward. This is the $+\hat{u}$ direction.
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: 75a
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