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$\cdot$ Usain Bolt of Jamaica set a world record in 2009 for the 200 -meter dash with a time of 19.19 seconds. What was his averagespeed? Give your answer in meters per second and miles perhour.

The Answer is $\left[10.4 \frac{\mathrm{m}}{\mathrm{s}}\right]$ And $\left[23.3 \frac{\mathrm{mi}}{\mathrm{hr}}\right]$

Physics 101 Mechanics

Chapter 2

One-Dimensional Kinematics

Motion Along a Straight Line

Rutgers, The State University of New Jersey

University of Sheffield

McMaster University

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you told him this problem that Hussein Bolt of Jamaica in 2009 set the world record for the 200 m. That's my distance travel dash. In a time of 19.19 seconds, you're asked to find the average speed and that's simply a matter of using the equation. Speed equals total distance over total time. This is average speed, so 200 m divided by 19.19 seconds. You divide that out and get 10.4 meters per second. So that's the answer for the first part and then for the second part of the problem, they want you to solve or convert that into MPH. So 10.4 m per second times. I happen to know there's 3600 seconds in one hour and I happen to know that there is every one mile. There are 1609 m so that the seconds cancel on the meters cancel and you're left with MPH. You do the math on that 10.4 times 3600 divided by 1000 and you get 37.4 37 point. No, sorry. Something wrong with that. You check my math. 10.4 times. 30. 600. I know I did wrong. Divided by 16. 09 Apologize. You get 23.3. Yes, 23 0.3 MPH. And that is the answer for second part.

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