Final answer:
Uniform velocity refers to the state where an object moves at a consistent speed and in a fixed direction, represented by answer a. Speed, direction. This is a foundational concept in the study of motion in physics.
Step-by-step explanation:
Uniform velocity means moving at the same speed and in the same direction unless an unbalanced force acts upon that object. Therefore, the correct answer is a. Speed, direction. This concept is crucial in understanding motion in physics as it pertains to the principles of inertia and dynamics. Uniform motion implies that an object is moving in such a way that its velocity, which is a vector quantity encompassing both speed and direction, remains constant unless acted upon by an external force.
When we talk about uniform circular motion, we refer to a situation where an object travels on a circular path at a constant speed—though its direction changes, resulting in centripetal acceleration. This is distinct from any motion that accelerates linearly with a changing speed, or motion that stops and then starts.