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A bird is sitting on the top of a 80 m high tree. From a point on the ground, the angle of elevation of the bird is `45^(@)`. The bird flies away horizontally in such a way that it remained at a constant height from the ground. After 2 secounds, the angle of elevation of the bird from the same point is `30^(@)`. Find the speed of flying of the bird. (Take `sqrt3=1.732`).

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The correct Answer is:
BC = 80 m
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