Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 5 - Force and Motion - Exercises and Problems - Page 135: 28

Answer

See the figures below.

Work Step by Step

a) The object is speeding up downward which means that the net acceleration is directed down. Hence, the net force is also downward. See the figure below. b) The object is slowing down while moving up which means that the net acceleration is also directed down. Hence, the net force is also downward. See the figure below.
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