Answer
$$v_{average}=\frac{30 m}{2 s}=15\frac{m}{s}$$
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 3 - Plug and Chug - Page 53: 29
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