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http://www.askphysics.com/a-stone-is-thrown-from-a-bridge-at-an-angle-30-degree-with-horizontal-with-a-velocity-25ms-if-the-stone-strike-the-water-surface-after-2-5seccalculate-the-height-of-bridge-from-the-water-surface/
A stone is thrown from a bridge at an angle 30 degree with horizontal with a velocity 25m/s.If the stone strike the water surface after 2.5sec,calculate the height of bridge from the water surface