Answer
Yes, a net force is external to the system, and is required to accelerate the system.
Work Step by Step
This is discussed on page 78.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 5 - Reading Check Questions (Comprehension) - Page 85-86: 8
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