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Introductory Physics Homework Help
Running Kinematics: Analyzing Speed and Acceleration in a Marathon
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[QUOTE="physicsnobrain, post: 4503865, member: 487906"] [h2]Homework Statement [/h2] A man decided to run a marathon. [ATTACH=full]163942[/ATTACH] (a) What was his average speed, in m/s, for the first 5K? (b) At 5K, was he speeding up or slowing down? Explain. [h2]Homework Equations[/h2] a) change in distance/time b) acceleration = change in velocity/ change in time[h2]The Attempt at a Solution[/h2] So for part a I simply solve for average speed which is change in distance / time. I get 3.87m/s (I believe this is the right sig digs) part b I'm not too sure if I am doing it right. I believe for him to be speeding up there needs to be acceleration @ 5K. So now I solve if there is acceleration at 5k. I start by doing acceleration = change in velocity / change in time. So a = (3.87m/s - 0m/s) / (1292s - 0s) a= 0.0039953 m/s^2 So the acceleration at 5k is 3.0x10^-3 m/s^2. And since there is some form of positive acceleration found at 5K, this means he is in fact speeding up at 5K. Am I correct for part B, or completely wrong? I need help. [/QUOTE]
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Running Kinematics: Analyzing Speed and Acceleration in a Marathon
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