A hot air balloon rising vertically is tracked by an observer located 4 km from the
Chapter 3, Problem 21(choose chapter or problem)
A hot air balloon rising vertically is tracked by an observer located 4 km from the lift-off point. At a certain moment, the angle between the observers line of sight and the horizontal is 5 , and it is changing at a rate of 0.2 rad/min. How fast is the balloon rising at this moment?
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