Conceptual Physics (12th Edition)

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

Chapter 7 - Think and Explain: 81

Answer

The design won't work in the real world, with friction. The second hill is the same height as the first, and the car, if starting with a very slow speed, will not reach its original height and attain its original PE. Some of the original potential energy will be converted into thermal and sound energy.
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