Answer
The force is the wall pushing back against your fingers.
Work Step by Step
Whenever object A exerts a force on object B, we find that object B exerts an equal and opposite force on object A.
This is discussed on page 76.
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: 1
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