Hello!
Acceleration is the measure of the changing speed of a body over time, in the same manner as speed is the measure of the changing position of a body.
If we know the speed for some initial time moment
and the speed
for some other moment
and if we know also that the change of speed was uniform, then this change is the (uniform) acceleration
If we don't know that the change was uniform, then this formula gives us the average acceleration. Note that only a difference between times is required, so we may set a reference point for time anywhere.
For this problem, we know
(moves from rest) and
so the acceleration, uniform or average, is
This is the answer.
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