Answer: Toward the center of the circle.
This situation is characteristic of the uniform circular motion , in which the movement of a body describes a circumference of a given radius with constant speed.
However, in this movement the velocity has a constant magnitude, but its direction varies continuously.
Let's say [tex]\vec{V}[/tex] is the velocity vector, whose direction is perpendicular to the radius [tex]r[/tex] of the trajectory, therefore
the acceleration [tex]\vec{a}[/tex] is directed toward the center of the circumference.
