Posted by John on Saturday, November 5, 2011 at 5:02pm.
At a particular instant, a stationary observer on the ground sees a package falling from a moving airplane with a speed vobserver at an angle θ to the vertical. To the pilot flying horizontally at a constant speed relative to the ground the package appears to be falling vertically with a speed vpilot at that same instant. What is the speed of the pilot relative to the ground in terms of the given quantities?

Physics  drwls, Saturday, November 5, 2011 at 5:26pm
Vpilot = Vobserver sin θ
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