Answer
My friend is incorrect in this case.
Work Step by Step
Let's call east the positive direction. If the car is moving east with a positive velocity and slowing down, its acceleration is negative, meaning it is directed toward the west.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 3 - Think and Discuss - Page 56: 93
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