## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# 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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