The position vector of a particle is given as \( \vec{r}=\left(t^{2...

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The position vector of a particle is given as \( \vec{r}=\left(t^{2}-8 t+12\right) \hat{i}+t^{2} \hat{j} \). The time after which
\( \mathrm{P} \) velocity vector and acceleration vector becomes - perpendicular to each other is equal to :-
(1) 1
(2) 2
(3) 3
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