Which term describes speed that remains constant throughout the motion?

The term that describes speed remaining constant throughout the motion is known as constant speed. When an object moves at a constant speed, it travels equal distances in equal intervals of time without speeding up or slowing down. This concept is critical in understanding motion, as it signifies uniformity in velocity over a period, making calculations and predictions about the object's motion simpler.

In contrast, instantaneous speed refers to the speed of an object at a specific moment in time, which may vary throughout an object's motion. Acceleration refers to the rate of change of velocity, indicating that the object is either speeding up or slowing down, therefore not maintaining a constant speed. Average speed is calculated by taking the total distance traveled divided by the total time taken; it does not reflect the consistency of speed at which the object travels. Hence, constant speed is the most appropriate descriptor for motion without variation in speed.