The position vector of a particle is \( \vec{r}=(a \cos \omega t) \...

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The position vector of a particle is \( \vec{r}=(a \cos \omega t) \hat{i}+(a \sin \omega t) \hat{j} \). The velocity of the particle is
(a) directed towards the origin
(b) directed away from the origin
(c) parallel to the position vector
(d) perpendicular to the position vector
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