What term describes a change in velocity?

The term that describes a change in velocity is acceleration. Acceleration occurs when an object's speed increases, decreases, or changes direction. It is a vector quantity, meaning it has both magnitude and direction. When an object increases its velocity, it is undergoing positive acceleration, while a decrease in velocity is often referred to as negative acceleration or deceleration.

Other options such as uniform motion and constant speed refer to situations where the velocity remains unchanged over time. If an object's speed and direction do not vary, it is not experiencing any acceleration, which is why these terms do not apply to the scenario described in the question. Therefore, securing the concept of acceleration is crucial for understanding the principles of motion in building maintenance and other physical applications.