Final answer:
The correct answer to the question is C. Circular and angular motion, where uniform circular motion is when an object travels on a circular path at a constant speed, and it is a form of angular motion due to the continuous change in the direction of the velocity vector.
Step-by-step explanation:
The question pertains to two types of motion in which objects maintain a constant speed while continuously changing direction. The correct answer is C. Circular and angular motion. When an object travels on a circular path at a constant speed, it is experiencing uniform circular motion, which is a type of angular motion because the direction of the velocity vector changes at every point of the path.
Examples of such motion include a car rounding a bend at a constant speed, illustrating circular motion, and a merry-go-round increasing from rest to a constant rotational speed, representing angular motion. This topic connects to broader concepts in rotational motion and the use of kinematics variables to describe motion. Importantly, pure rotational motion, another form of angular motion, occurs when points in an object move in circular paths centered on one point.