A particle is projected upwards with a velocity of \( 110 \mathrm{~m} / \mathrm{sec} \) at an an...

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A particle is projected upwards with a velocity of \( 110 \mathrm{~m} / \mathrm{sec} \) at an angle of \( 60^{\circ} \) with the vertical. Find the time when the particle will move perpendicular to its initial direction, taking \( g \) \( =10 \mathrm{~m} / \mathrm{sec}^{2} \) :
(A) 10 seconds
(B) 22 seconds
(C) 5 seconds
(D) \( 10 \sqrt{3} \) seconds
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