Conceptual Physics (12th Edition)

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

Chapter 3 - Think and Discuss: 94

Answer

Your partner is correct; both balls undergo the same acceleration in the absence of air resistance.

Work Step by Step

This is discussed on pages 46-47. The acceleration of a freely falling object, in the absence of air resistance, is always $10 \frac{m}{s^{2}}$ directed downward. Madison's and Anthony's balls have oppositely directed velocities, but identical accelerations.
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