Consider a mass point moving around a fixed point on a circle with radius $r$ with constant angular velocity $ω$. At a certain moment of time, the connection is removed, and the point mass is flying away tangentially to the circle.
I need to describe this motion in the inertial system (where the point mass is rotating in the beginning) and in a reference system rotating with angular velocity $ω$ around the fixed point (where the point mass is at rest in the beginning). How to do that?