Question

an aeroplane flying horizontally 1000√3m above the ground is observed at an angle of elevation 60° from a point on the ground after 10 seconds, the angle of elevation at the point of observation changes to 30°.find the speed of the plane in m/s.

Answer 1

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QUESTION :- an aeroplane flying horizontally 1000√3m above the ground is observed at an angle of elevation 60° from a point on the ground after 10 seconds, the angle of elevation at the point of observation changes to 30°.find the speed of the plane in m/s.


Let A and B be the two positions of the aeroplane and let O be the point of observation.