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The 3rd example for physics from https://docs.google.com/document/d/1MRA-c-nIGyi9auwK7muDK6o2JQGGnzBgohzfi4eyNQg/edit switches the position-velocity and velocity-acceleration relationships:
"The position of an object is the derivative of its velocity, meaning the position is related to the rate of change of velocity over time. Similarly, velocity is the derivative of acceleration.position = Δvelocity/Δtime and velocity = Δacceleration/Δtime"Also, I should note that when trying to access this forum through http://services.google.com/edu/computational-thinking/forum.html using Firefox, I get the following error:"Load denied by X-Frame-Options: https://groups.google.com/ does not permit framing by http://services.google.com/edu/computational-thinking/forum-toc.html."Thanks.