it means the object is moving at a constant speed
An object that is moving at a constant speed.
Not necessarily. If the horizontal line is laying on top of the x-axis, then the speed is zero at any time, and the object isn't moving. But if the horizontal line is parallel to the x-axis, then the object is moving with constant speed.
If a line is decreasing on a velocity vs. time graph, it means the object's velocity is decreasing over time. This could indicate that the object is slowing down or moving in the opposite direction.
Many sets of data do not form into straight lines. If by "What if" you mean how to plot a line onto this graph. Then simply draw a curved line of best fit.
A graph shows distance on the vertical axis and time on the horizontal axis. If the speed is steadily increasing, what will the line representing speed look like on the graph? Could any part of the speed line ever become perfictly vertical? why or why not
it means that the object is gradually getting faster
Time is plotted on the X-axis. Speed or velocity is plotted on the Y-axis. A straight horizontal line on a speed-time graph means that speed is constant. It is not changing over time. A straight line does not mean that the object is not moving!
Constant speed..
I would like to state first that you misspelled horizontal. The answer to your question is Constant speed.
Standing still or not moving
If you are analyzing speed with respect to time, then you are decelerating.
It means that the object in question is moving at a constant speed.If the graph is a straight horizontal line, then the speed is zero.
Constant speed. Zero acceleration.
It means that the object in question is travelling at constant speed.
It means that the speed of the object is constant.
If a line is decreasing on a velocity vs. time graph, it means the object's velocity is decreasing over time. This could indicate that the object is slowing down or moving in the opposite direction.
line graph
BecAuse that would mean it is going an infinite speed. The slope of a distance time graph is the objects velocity or speed. If there is a line parallel to the distance axis, there is a vertical line. The slope of a vertical line is infinite. It is not possible to go an infinite speed.