At the moment the range finders elevation angle is 4 the


A hot air balloon rising straight up from a level field is tracked by a range finder 150m from the lifto↵ point. At the moment the range finder's elevation angle is ? 4 , the angle is increasing at the rate of 0.14rad/min, How fast is the balloon rising at that moment.

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Mathematics: At the moment the range finders elevation angle is 4 the
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