Answer
Calculate the mass multiplied by acceleration.
$$ma = (12 kg)(7.0 \frac{m}{s^{2}}) = 84 \frac{kg \cdot m}{s^{2}} = 84 N$$
The net force equals 84 N, which we were asked to show.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 4 - Plug and Chug - Page 69: 47
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