What would the slope of a line on an acceleration-time graph look like for an object moving at constant velocity?

In an acceleration-time graph, the slope indicates the acceleration of an object. When an object is moving at a constant velocity, it means that there is no change in its speed. Consequently, the acceleration of the object is zero.

When represented graphically, a constant acceleration of zero is depicted as a straight horizontal line along the time axis. This indicates that there is no increase or decrease in acceleration over time, as the object maintains its speed consistently. A diagonal line, whether ascending or descending, would suggest a change in acceleration, while a curved line upward would indicate increasing acceleration. Therefore, a straight horizontal line is the correct representation of an object moving at constant velocity, confirming that its acceleration remains unchanged at zero throughout the time period considered.