Depends on the type of graph. Usually, though, it is the length fop the line/arrow.
A speed graph measures the distance devided over time. Acceleration graph measures the change in speed over time.
Speed can be shown on a graph of position versus time, and acceleration can be shown on a graph of speed versus time.
speed graph
Acceleration is indicated on a speed/time graph.
You can't. However, you can find the change in speed between two points in time by finding the area under the acceleration-time graph.
-- If the graph displays speed against time, then speed of zero is indicated wherever the graph-line touches the x-axis. -- If the graph displays distance against time, then speed of zero is indicated wherever the graph-line is horizontal. -- If the graph displays acceleration (magnitude) against time, then the graph can tell you when speed is increasing or decreasing, but it doesn't show what the actual speed is.
Speed (in the radial direction) = slope of the graph.
No, but the slope of the graph does.
Slope of the graph will give you speed.
The graph will be that of a straight line with the basic form of y=mx+b.
Line graph.
If speed changes, then the speed/time graph has up/down curves in it.