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OpenStudy (anonymous):
an airplane flying at an altitude of 6KM is approaching a computer controlled radar installation at a speed of 1000 kph. when first observed, the line of sight from the radar to the air plane makes an angle of 20degrees with the horizon. assuming the plane maintains the same speed and the altitude, what is the rate of change of the angle between the ground and the line of sight to the plane.?..
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