Apple Game Frameworks and Technologies: Gravity “speed” vs. “acceleration”

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In Chapter 3, subsection “A Closer Look at Physics Bodies”, sidebar box “The Gravity of the Situation”:

It refers to “speed” when it should be “acceleration”. 9.8m/s is the rate of acceleration for a falling object on Earth (in the absence of resistance).

Thanks (I’m just a few chapters in, but finding the book good and useful so far).