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I am looking at a textbook example but I am not able to go from where I have set the question mark and to the where the arrow is pointing. Could someone please explain where the x's are coming from and how they have done it?

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ALEXANDER
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1 Answers1

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You are missing some context. It is probably written somewhere that $x(t)=v_0t+\frac a2 t^2$ ($x$ is a function of $t$).

please delete me
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