A particle is projected from the ground at an angle \( 30^{\circ} \) with the horizontal with an...

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A particle is projected from the ground at an angle \( 30^{\circ} \) with the horizontal with an initial speed \( 20 \mathrm{~m} \mathrm{~s}^{-1} \). After how much time will the velocity vector of projectile be perpendicular to the initial velocity? [in second]
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