A boy whose eye level is 1.3m from the ground, spots a balloon moving with the wind in a horizontal lines at some height from the ground. The angle of elevation of the balloon from the eyes of the boy at an instance is 60°. After 2 sec. the angle of elevation reduces to 30° . If the speed of the wind is 29√3 m/ sec. Then, find the height of the balloon from the ground.
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