Conceptual Physics (12th Edition)

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

Chapter 10 - Think and Solve: 31

Answer

3500 MJ.

Work Step by Step

The total energy is $PE + KE = 5000 MJ + 4500 MJ = 9500 MJ$. Later, the total energy is still the same, so $KE = 9500 MJ - 6000 MJ = 3500 MJ$. This is discussed on pages 197-198.
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