Answer
Energy is conserved. The initial 1000 J of PE is transformed into 900 J of KE and 100 J of thermal and sound energy, heating herself, the air, and the slide.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 7 - Think and Explain - Page 129-130: 77
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