traditionally a straight 'a' average is achieved when a student's final marks for ALL subjects taken are 90% or higher.
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For a parabola in a normal position ... with its nose either straight up or straight down ... the x-value of the vertex is midway between the zeros of the function, i.e. their average.
They are the same for a straight line but for any curve, the slope will change from point to point whereas the average rate of change (between two points) will remain the same.
That would be the case if the object moved only among a straight line, and only in one direction (i.e., it didn't move back and forth).
A straight line.A straight line.A straight line.A straight line.
Average acceleration = change in speed/time = 2.4/0.8 = 3 ms-2