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AP Physics C: Mechanics
1.5 Motion in Two or Three Dimensions
1.2 Displacement, Velocity, and Acceleration
AdvancedMCQMathematicalConceptual23.1k
A particle moves in the \(xy\)-plane such that its position vector as a function of time \(t\) is given by \(\vec{r}(t) = b\cos(\omega t)\hat{i} + c\sin(\omega t)\hat{j}\), where \(b\), \(c\), and \(\omega\) are positive constants with \(b > c\). Which row in the table correctly identifies the locations on the particle's trajectory where its speed is greatest and describes the direction of its acceleration vector?

Location of Greatest SpeedDirection of Acceleration Vector
APoints on the \(x\)-axisNot always directed toward the origin
BPoints on the \(x\)-axisAlways directed toward the origin
CPoints on the \(y\)-axisNot always directed toward the origin
DPoints on the \(y\)-axisAlways directed toward the origin

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