Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 2 - Think and Explain - Page 36-38: 60

Answer

No, it is not in equilibrium during this brief moment.

Work Step by Step

At that moment, the force of gravity still acts on it. The net force on the ball is not zero and therefore is not in mechanical equilibrium.
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