How fast is the balloon rising at the given moment

Reference no: EM131008637

A hot air balloon rising vertically is tracked by an observer located 5 km from the lift-off point. At a certain moment, the angle between the observer's line of sight and the horizontal is π/5, and it is changing at a rate of 0.5 rad/h. How fast is the balloon rising at this moment?

Reference no: EM131008637

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