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Running Kinematics: Analyzing Speed and Acceleration in a Marathon
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[QUOTE="collinsmark, post: 4503921, member: 114325"] 'Looks right to me. :approve: So far so good. :smile: As far as the significant figures go however, you might want to hold onto a couple of more significant figures for later, since you will use this result in a future calculation. It may be okay to put "3.87 m/s" as the official answer for part (a), but privately hold onto more of them as you continue on to part (b). I'm quite confident that's not the right approach. I don't think the question is asking you to find the runner's acceleration, certainly not during the first 5K anyway. I think it's safe to assume that the runner's acceleration is not uniform. (Even if you were to assume that the runner had uniform acceleration for the first 5K-- which would lead to a really surreal situation btw, your approach still isn't right. The 3.87 m/s figure is the runner's [I]average[/I] speed for the first 5K, not necessarily his [I]final[/I] speed.) You've found the average speed of the runner for the first 5K. What is the runner's speed during the second 5K? (I.e., what is the average speed between the 5K mark and the 10K mark?) Compare the two speeds (qualitatively compare them, that is). [/QUOTE]
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Running Kinematics: Analyzing Speed and Acceleration in a Marathon
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