Answer
In region CD, the block's kinetic energy is decreasing.
Work Step by Step
When the block reaches the rough ground, a friction force is introduced. This force removes kinetic energy from the system and converts it to heat.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 8 - Potential Energy and Conservation of Energy - Questions - Page 201: 5c
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