A stone projected at an angle of 6 0 ∘ from the ground level, strikes at an angle of 3 0 ∘ on the roof of a building of height 30 m then the speed of projection of the stone is :-

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x : v cos 3 0 ∘ = u cos 6 0 ∘ ​ y : ( v sin 3 0 ∘ ) 2 = ( u sin 6 0 ∘ ) 2 + 2 × ( − g ) × h u = 30 h ​ ​

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