Posted by **Andres** on Monday, October 10, 2011 at 11:08pm.

an observer stands 200 m from the launch site of a hot-air balloon. the balloon rises vertically at a constant rate of 4 m/s. how fast is the angle of elevation increasing 30 s after the launch.

- Calculus -
**Anonymous**, Friday, February 5, 2016 at 7:13am
idk

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