Question

The angle of elevation of a jet plane from a point A on the ground is 60°. After a
flight of 15 seconds, the angle of elevation changes to 30°. If the jet plane is flying
at a constant height of 1500 √3 m, find the speed of the jet plane.



anybody know the answer ​

Answer 1

Answer is 200 meters per second

Answer 2

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please refer to the image

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