Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 2 - One-Dimensional Kinematics - Problems and Conceptual Exercises - Page 48: 8

Answer

(a) The average speed is equal to 20 m/s. (b) Equal time is spent at 15 m/s and 25 m/s.

Work Step by Step

If the same time is spent at both speeds, the average speed is just the arithmetic mean of the speeds: $\frac{15 m/s+25 m/s}{2}=20 m/s$.
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