University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 5 - Applying Newton's Laws - Problems - Discussion Questions - Page 159: Q5.21


Yes, you can tell.

Work Step by Step

The ball that is falling within the vacuum will have a constant acceleration. The position of the ball will follow the equation $y=-\frac{1}{2}gt^2$. The ball that is falling in air suffers air resistance, and if the tube is tall enough, eventually reaches terminal velocity and falls with constant speed. On the photograph, it will travel equal distances in equal time intervals.
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