Final answer:
In uniform circular motion, the angle between the vectors of tangential velocity and centripetal force is 90°.
Step-by-step explanation:
The direction of acceleration relative to the direction of motion depends on the type of motion being considered. In uniform circular motion, the direction of velocity is tangential to the circle, while the direction of acceleration is radially outward, pointing away from the center of the circle. So, in this case, the angle formed between the vectors of tangential velocity and centripetal force is 90°.