The origin of a graph is the point specified by the ordered pair (0,0). It is where both the x-coordinate and the y-coordinate are zero and their respective axes intercept.
That's the "coordinate origin" or simply the "origin".
You cannot since the graph shows displacement in the radial direction against time. Information on transverse displacement, and therefore transverse velocity, is not shown. For example, there is no difference in the graph of you're staying still and that of your running around in a circle whose centre is the origin of the graph. In both cases, your displacement from the origin does not change and so the graph is a horizontal line. In the first case the velocity is 0 and in the second it is a constantly changing vector. All that you can find is the component of the velocity in the radial direction and this is the slope of the graph at the point in question.
It depends on what you are graphing and the domain. If you are tracking daily temperature in your town, for example, the only difference will be in the y-intercept: that is how high or low your graph is. If you must show the origin on the chart, though, the vertical scale will be much greater. If graphing some aspect of thermodynamics, the Kelvin graph should be simpler because it is likely to go through the origin.
Constant velocityZero acceleration and/or Moving object
It will measure acceleration in the direction towards or away from the origin.
an origin can not be drawn because its (0,0) the middle of the graph
Graph originates from Greece.
It's called the origin; the center of a graph.
origin
The origin.
the origin
The origin: (0,0)
It is the point of origin of the x and y axes of the graph
The Origin
The origin
the origin
the origin is the point in the graph that can be fourth vertex