Final answer:
In uniform circular motion, the speed, radial component of acceleration, and instantaneous velocity are constant.
Step-by-step explanation:
In uniform circular motion, the following quantities are constant:
- The speed: The magnitude of the velocity remains constant.
- The radial component of acceleration: The acceleration points radially inward toward the center of the circle.
- The instantaneous velocity: The direction of the velocity is always tangential to the circle.