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A particle is projected at an angle \( =30^{\circ} \) with the horizontal, with a velocity of \( 10 \mathrm{~m} / \mathrm{s} \) then
(A) after \( 2 s \) the velocity of particle makes an angle of \( 60^{\circ} \) with initial velocity vector
(B) after \( 1 \mathrm{~s} \) the velocity of particle makes an angle of \( 60^{\circ} \) with initial velocity vector
(C) the magnitude of velocity of particle after \( 1 \mathrm{~s} \) is \( 10 \mathrm{~m} / \mathrm{s} \)
(D) the magnitude of velocity of particle after \( 1 \mathrm{~s} \) is \( 5 \mathrm{~m} / \mathrm{s} \)
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