Conceptual Physics (12th Edition)

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

Chapter 7 - Think and Explain: 96

Answer

Your friend is correct, in theory.

Work Step by Step

Constant braking changes KE into thermal energy, meaning lower efficiency, more fuel usage, and decreased air quality. Regenerative braking (see "recycled energy") can help with this. However, note that letting, say, north-south commuters proceed for long stretches would hinder east-west drivers, so your friend's plan may not be that practical.
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