Dynamics - Rigid Body relative velocity example 2

Motion of a rolling wheel. Like and subscribe! And get the notes here:
Thermodynamics: drive.google.c...
Mechanics of Materials: drive.google.c...
Statics: drive.google.c...
Dynamics: drive.google.c...

[@humbletrash7981]

How come on your other problems we don't need to specify whether angular velocity is positive or negative but on this one we do?

[@tunacannot]

i am curious of how I can do so that I can calculate A based on O and still get the right result.

[@iESTO818]

thank you!!!