Answer
32 N. 8 N.
Work Step by Step
The strongest possible net force occurs when the forces are aligned.
$$20 N + 12 N = 32 N$$
The weakest possible net force occurs when they point in opposite directions.
$$20 N - 12 N = 8 N$$
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: 50
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