Constant speed. Zero acceleration.
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.
If the axes are time/distance then, and only then, it means a constant velocityIf not, then this Q doesn't have enough data to A
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.
A straight line graph (on the cartesian or coordinate plane).
Standing still or not moving
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.
Look for the key to the symbols on your graph, which will explain the straight line.
If the axes are time/distance then, and only then, it means a constant velocityIf not, then this Q doesn't have enough data to A
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.
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.
When there is a curved line going upwards on a graph it means the distance is increasing
y axis
A straight line graph (on the cartesian or coordinate plane).
straight line distance on non-rotated axes...
Standing still or not moving
With distance on the x axis and time on the y axis a steep line would indicate a short distance traveled over a long period of time, depending on the scale of the graph.
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!