+ e.wlu.ca/d21/le/content/404589/viewContent/2598825/View?ou=404589 2. [4 marks] A helicopter makes a vertical takeoff and rises at a rate of 40km/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.] 1 1 12 7 + Download Reflect in ePortfolio 80% 2 13. C ~ e # O n search Prisc F12 F9 F10 F11 C F7 F8 X F6 F2 FS F4 F5 8 S 5 6 3 No O P W E R