it is infinite and is a parabola
Its first derivative is non-zero
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That is not a proper answer. All that it means is that the relationship between the two variables in question (x and y) is some nonlinear continuous function.
Actually the first derivative can be zero at specific point(s), but this is specifically true whereas a non-zero value is generally true.
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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 object is accelerating or decelerating in the radial direction.
Nonlinearities. To be more specific you would have to provide more information.
It tells you that the velocity of the body is not constant. There is acceleration or deceleration.