A stone projected at an angle of \( 60^{\circ} \) from the ground level strikes at an angle of \....

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A stone projected at an angle of \( 60^{\circ} \) from the ground level strikes at an angle of \( 30^{\circ} \) on the roof of a
\( \mathrm{P} \)
building of height ' \( h \) '. Then the speed of projection of the stone is :
(1) \( \sqrt{2 g h} \)
(2) \( \sqrt{6 g h} \)
(3) \( \sqrt{3 g h} \)
(4) \( \sqrt{g h} \)


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