AP Physics C: Mechanics
1.5 Motion in Two or Three Dimensions
1.2 Displacement, Velocity, and Acceleration
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 Speed | Direction of Acceleration Vector | |
|---|---|---|
| A | Points on the \(x\)-axis | Not always directed toward the origin |
| B | Points on the \(x\)-axis | Always directed toward the origin |
| C | Points on the \(y\)-axis | Not always directed toward the origin |
| D | Points on the \(y\)-axis | Always directed toward the origin |
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