23. A bird is sitting on the topofa 80 m high tree. Froma point on the ground, the angle of elevation of a bird is45. The bird flies away from the point of observation horizontally and remains at a constant height. After 2seconds, the angle of elevation ofthe bird from the point of observation becomes 30Â° Find the speed of flyingof the bird. (Use y3 1.7)

23. A bird is sitting on the topofa 80 m high tree. Froma point on the

1.	23. A bird is sitting on the topofa 80 m high tree. Froma point on the ground, the angle of elevation of a bird is45. The bird flies away from the point of observation horizontally and remains at a constant height. After 2seconds, the angle of elevation ofthe bird from the point of observation becomes 30Â° Find the speed of flyingof the bird. (Use y3 1.7)
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