a bird is sitting on the top of a tree, which is 80m high. The Angel of elevation of the bird, from the point on the gound is 45°. The bird flies away from the point of observation horizontal and remains at a constant height. after 2 seconds, the angle of elevation of the bird from the point of observation becomes 30°. find the speed of flying of the bird ( take root 3 = 1.73 )
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