Answer:
a. Perpendicular.
Explanation:
The relation between angular velocity vector and linear velocity vector is described by a cross product:
[tex]\vec v = \vec \omega \times \vec r[/tex]
Where [tex]\vec r[/tex] is perpendicular to the rotation axis and [tex]\vec \omega[/tex] is parallel to the same axis. By definition of cross product, [tex]\vec v[/tex] is a vector which is perpendicular to both vectors. Therefore, linear velocity vector is perpendicular to angular velocity vector. The correct answer is A.
