Answer
a. By Newton's third law, the wall pushes on you with 40 N.
b. Use Newton's second law. $a = \frac{F}{m} = \frac{40 N}{80 kg} = 0.5 \frac{m}{s^{2}}$.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 5 - Think and Solve - Page 86: 28
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