Answer
$$v_{ave}=20.$$
Work Step by Step
By definition, the average velocity is the change in position over the time interval, divided by the length of that interval:
$$v_{ave}=\frac{s(4)-s(1)}{4-1}=\frac{144-84}{3}=20.$$
Calculus: Early Transcendentals (2nd Edition)
by Briggs, Bill L.; Cochran, Lyle; Gillett, Bernard
Published by
Pearson
ISBN 10:
0321947347
ISBN 13:
978-0-32194-734-5
Chapter 2 - Limits - 2.1 The Idea of Limits - 2.1 Exercises - Page 59: 8
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