A stone is projected from point A with speed \( \mathrm{u} \) P making an angle \( 60^{\circ} \)...

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A stone is projected from point A with speed \( \mathrm{u} \)
P making an angle \( 60^{\circ} \) with horizontal as shown. The

W fixed inclined surface makes an angle \( 30^{\circ} \) with horizontal. The stone lands at \( \mathrm{B} \) after time \( \mathrm{t} \). Then the distance \( \mathrm{AB} \) is equal to
(1) \( \frac{u t}{\sqrt{3}} \)
(2) \( \frac{\sqrt{3} u t}{2} \)
(3) \( \sqrt{3} u t \)
(4) \( 2 u t \)
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