Answer
Irreversible.
Work Step by Step
If there was a 100% energy efficient spring at the bottom of the slide, the conversion of potential into kinetic into elastic energies could be reversible, but due to friction, it's irreversible.
Thermodynamics: An Engineering Approach 8th Edition
by Cengel, Yunus; Boles, Michael
Published by
McGraw-Hill Education
ISBN 10:
0-07339-817-9
ISBN 13:
978-0-07339-817-4
Chapter 6 - The Second Law of Thermodynamics - Problems - Page 316: 6-59C
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