Posted by **marlyn** on Saturday, December 5, 2009 at 4:23pm.

a hot-air balloon rising srtaight up from level field is tracked by a range finder 5000 feet from the liftoff point. At the moment the range finder's elevation angle is 45 degrees (pie/4 radians), the angle is increasing at the rate of 0.14 radians per minute. how fast is the balloon rising at that moment?

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