Answer
The vector sum of the forces acting on the object equals zero.
Yes, the net force must necessarily be zero.
Work Step by Step
This is discussed on page 30.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 2 - Think and Explain - Page 36-38: 51
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