From v = u - (a*t)
then:
a = (v-u) / t
Select a point on a time(x) - velocity(y) graph, calculate the slope of a tangent to the line at this point , this is the rate of acceleration at that point.
On a data driven curve approximation is used.
On a mathematical curve differential calculus can be used.
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The answer depends on what is plotted on the graph and what is happening with the acceleration then.
The answer depends on the variables in the graph! In a graph of age against mass there is nothing that represents acceleration.
Acceleration is how fast you get up to speed.
The answer will depend on the variables plotted on the graph!
Acceleration is indicated on a speed/time graph.