Conceptual Physics (12th Edition)

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

Chapter 5 - Think and Explain: 72

Answer

The action force is Earth pulling downward on the ball. The reaction force is the ball pulling upward on the Earth. The ball's acceleration all along the path, including at the top, is $10 \frac{m}{s^{2}}$, directed downward. It is in free fall.
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