There are many different methods that can be used. The one to choose depends
on what other information is known. Since the question doesn't include any of
that, no guidance is possible.
There is one suggestion to offer, though:
A person likely to post this question is unlikely to encounter any problem where
the acceleration is not constant.
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Acceleration = Final velocity - Initial velocity / time
You use the information you're given, along with the equations and formulas you know that relate distance, time, speed, and acceleration, to calculate the number you're asked to find. And here's a tip: Chances are that the initial acceleration, the final acceleration, and the acceleration all along the way, are all the same number.
True
v2 - u2 = 2as so that a = (v2 - u2)/2s where u = initial velocity v = final velocity s = distance a = acceleration
This is imposible to calculate. In order to find acceleration, knowlege of at least 3 of these variables must be given: initial speed, final speed, distance, and time.