Observing a launch An observer stands 300 ft from the
Chapter 3, Problem 34(choose chapter or problem)
Observing a launch An observer stands 300 ft from the launch site of a hot-air balloon. The balloon is launched vertically and maintains a constant upward velocity of 20 ft>s. What is the rate of change of the angle of elevation of the balloon when it is 400 ft from the ground? The angle of elevation is the angle u between the observers line of sight to the balloon and the ground.
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