Question

A bird is sitting on the top of a tree which is 80 m high. The angle of elevation of the bird from apoint on the ground is 45°. The bird files away from the point of observation horizontally and
remains at a constant height. After 2 sec. the angle of elevation of the bird from the point of
observation becomes 30°. Find the speed of flying of bird​

Answer 1

so, the speed of bird is 40(√3-1) m/s

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