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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 10 - Think and Solve - Page 202: 31
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