In the centripetal movement, what happens with velocity is that it will remain constant, always pointing in its tangential direction of the trajectory. Said speed, although constant, will have a constant direction that will generate an acceleration that will always point towards the center of the circle radius. Both vectors as the turn is performed will always be perpendicular to each other.
The direction of the acceleration is longitudinal to the direction of velocity in for a body moving in a circle at constant speed.
Circular motion is the motion of an object in a circle at a constant speed. As the object is constantly changing its direction as it moving in a circle at constant speed.
At all instances, the object is moving tangent to the circle. The direction of velocity vector is tangent to the circle, as the direction of velocity vector is towards the direction of object's motion.
An object moving in a circle is accelerating due to its change in direction. The direction of the acceleration is inwards.
Therefore, the direction of the acceleration is longitudinal to the direction of velocity in for a body moving in a circle at constant speed.
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