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A hot air balloon rising vertically is tracked by an observer located 4km from the lift-off point. At a certain moment, the angle between

A hot air balloon rising vertically is tracked by an observer located 4km from the lift-off point. At a certain moment, the angle between the observer's line of sight and the horizon is , and is changing at a rate of 2 rad/min. How fast is the balloon rising at this moment?

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