# math-calculus

posted by
**maurice** on
.

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?