Answer
a) Their magnitudes are equal.
b) Their directions are opposite.
Work Step by Step
The only way to have two vectors whose sum is equal to zero is if they have the same magnitude and their directions are opposite, so they cancel each other.
Physics (10th Edition)
by Young, David; Stadler, Shane
Published by
Wiley
ISBN 10:
1118486897
ISBN 13:
978-1-11848-689-4
Chapter 1 - Introduction and Mathematical Concepts - Check Your Understanding - Page 12: 9
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