Posted by **maurice** on Thursday, December 30, 2010 at 8:09pm.

A spy tracks a rocket through a telescope to determine its velocity. The rocket is traveling vertically from a launching pad located 10 km away. At a certain moment, the spy's instruments show that the angle between the telescope and the ground is equal to 60 degrees and is changing at a rate of 0.5 radians/min. What is the rocket's velocity at that moment?

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