Answer
Increasing.
Work Step by Step
"Speeding up" signifies acceleration. Since the slope of the tangent line to the velocity at point $B$ is positive, the acceleration is positive and the speed is increasing.
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 15 - Oscillations - Questions - Page 434: 2f
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