Acceleration is measured in meters per second per second: m/s/s or m/s².

This means we need to find out how many m/s are travelled every s.

Which is the same as change in velocity over time.

We can work this out by looking at a time period in the graph and seeing how much the velocity changes. For example on this graph between second 3 and second 4 the velocity changes from 0 to 4: meaning that it changes 4 m/s every 1s

4/1= 4m/s²

So effectively you do up divided by across to give acceleration.

(bbc)
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Thank you so much, I really appreciate you pointing this out, I will look into it!!

Delete'Rise over Run' is a good way to remember it

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