A symmetric distribution.
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The curved line on a time vs. distance graph represents that the object is accelerating.
it is a line on a graph that is curved
The slope for a straight line graph is the ratio of the amount by which the graph goes up (the rise) for every unit that it goes to the right (the run). If the graph goes down, the slope is negative. For a curved graph, the gradient at any point is the slope of the tangent to the graph at that point.
The object is accelerating or decelerating in the radial direction.
Nonlinearities. To be more specific you would have to provide more information.