Answer
Yes, if the ball slows down, according to Newton's second law, there is a net force opposite to its motion.
This force is likely due to rolling friction and air resistance.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 4 - Think and Explain - Page 71-72: 59
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