[4 marks] A helicopter makes a vertical takeoff and rises at a rate of 10km/h. An observer standing 2 km away watches the takeoff. At
[4 marks] A helicopter makes a vertical takeoff and rises at a rate of 10km/h. An observer standing 2 km away watches the takeoff. At what rate is the observer's angle of elevation changing when the helicopter is 2 km above the ground? [Include a diagram as part of your solution.]
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