The vector tangential to the circle because the vector indicates the direction of the force on the object.
Centripetal force is the force acting on an object in circular motion directed towards the axis of rotation.
In a circular motion, the direction of the velocity vector is the same as the direction of the object's motion, the velocity vector is directed tangent to the circle as well.
It also indicate the direction of the centripetal force.
Thus, the vector tangential to the circle because the vector indicates the direction of the force on the object.
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