Conceptual Physics (12th Edition)

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

Chapter 3 - Think and Discuss: 95

Answer

On track A the ball moves at medium speed almost the entire time. On track B the ball sometimes moves at the same medium speed, but also spends considerable time moving more quickly, on the portion of the track where it has fallen a greater distance from its original starting point. Since the problem specifies that the tracks are the same length, the ball on track B finishes first.
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