A body is projected with velocity \( u \) at an angle of projection \( \theta \) with the horizo...

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A body is projected with velocity \( u \) at an angle of projection \( \theta \) with the horizontal. The direction of velocity of the body makes angle \( 30^{\circ} \) with the horizontal at \( t=2 \mathrm{~s} \) and then after \( 1 \mathrm{~s} \) it reaches the maximum height. Then
(1) \( u=20 \sqrt{3} \mathrm{~m} \mathrm{~s}^{-1} \)
(2) \( \theta=60^{\circ} \)
(3) \( \theta=30^{\circ} \)
(4) \( u=10 \sqrt{3} \mathrm{~m} \mathrm{~s}^{-1} \)
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