The
of the line on a velocity vs. time graph represents acceleration.

Assuming the usual convention that velocity is represented along the up and down, or y, axis and time is represented along the right and left, or x, axis, the answer is pretty obvious. Here’s a hint: all the points on a horizontal line have the same up and down position, so whatever is represented by that position (see above) is staying the same.

Explanation:

If the vertical axis is velocity and the horizontal axis is time, it means that the velocity is not varying over time.There is no acceleration, but if the velocity value is non-zero, them the location is changing at a constant velocity. Hope this helps have a awesome day/night❤️✨