- (D) See the figure, which shows the motion of the particle during the time interval −2 ≤ t ≤ 4.
The particle is at rest when t = 0 or 3, but reverses direction only at 3. The endpoints need
to be checked here, of course. Indeed, the maximum displacement occurs at one of those,
namely, when t = −2.
dmanu
(dmanu)
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