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Okay the answer at the back of the book is 0.60 m/s. Firstly, I thought that 'average speed' is actually 'average velocity'.

If that is the case then average velocity is delta d / t. If I take 0.12(d2) - 0 (d1) / 2.4 I get 0.05 m/s. Which according to the book is incorrect. The only way that I get the correct answer if it I add up all the distances (0+0.44+0.88+0.12) and divide by the time (2.4) = 0.60 m/s.

I'm confused on why I should be adding up all the distances instead of taking the final distance minus the original distance, divided by the time?

What am I missing here?

Thanks in advance.