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It's the rate of change of gradient. Or if you have the function of the distance-time graph, it's d2x/dt2.
The line and the bar graph is used to describe a graph that compares two sets of data.
You can describe it using words or in graph form.
a bar graph
The answer depends on what type of information is contained in the graph, the form of the graph and how good you are at reading and interpreting that information.