Final answer:
The question seems to be based on a misunderstanding since a point at rest should have no velocity. The angle formed between tangential velocity and centripetal force in uniform circular motion is always 90 degrees. Therefore, the correct answer is d. 90 degrees.
Step-by-step explanation:
The question asks about the angle between two velocities when a point is at rest. Since a point at rest implies no net movement, this scenario is not feasible in real-world physics.
However, to explain the concept, if we look at a simplified case in vector mathematics, the cosine rule or specific vector addition rules could be used to find the angle between two velocities if they were part of a scenario leading to a point at rest.
For the angle formed between the vectors of tangential velocity and centripetal force, the correct answer is 90° (c), since these two vectors are always perpendicular to each other in uniform circular motion.
The statement that the angle between acceleration and velocity is 90°, and the body experiences centripetal acceleration (d) is correct for an object moving in a circular path at constant speed, as this is how the centripetal acceleration is always directed towards the center of the circle, perpendicular to the velocity vector.