Physics, 20.07.2019 08:20 black4sureg

Aplane flies horizontally at an altitude of 3 km and passes directly over a tracking telescope on the ground. when the angle of elevation is π/6, this angle is decreasing at a rate of π/4 rad/min. how fast is the plane traveling at that time?

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Aplane flies horizontally at an altitude of 3 km and passes directly over a tracking telescope on th...