Answer
Point $2$.
Work Step by Step
At $-x_m$, the acceleration will be at an extrema and will be in the positive direction. This corresponds to point $2$.
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 435: 3a
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