Two particles are moving with velocity \( \vec{v}_{1}=\hat{i}-2 t \hat{j} \mathrm{~m} / \mathrm{....

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Two particles are moving with velocity
P
\( \vec{v}_{1}=\hat{i}-2 t \hat{j} \mathrm{~m} / \mathrm{s} \) and \( \vec{v}_{2}=4 \hat{i}+\hat{j} \mathrm{~m} / \mathrm{s} \) respectively
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Time at which they are moving perpendicular to each other is.


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