Graph Velocity-Time of Usain Bolt 200m Race

[Nazz_Designs]

I am looking for a graph of velocity vs time for the 200m race of Mr Usain Bolt which he did in 19.30 seconds he did during the olympic races.
I appreciate if someone can provide it in this forum.
Thanks

Ps. sorry if i posted it in the wrong place, but i don't in which category i should put it.

 

[Bob_for_short]

It should be something like this:



|..............
|....
|...
|.______________________________________|___

 

[Nazz_Designs]

yes, i know the shape.

But during class we had a question which involved the graph.

my professor said that he thinks that the graph is not wrong.
and he told us if anyone can deduct what he thinks the problem is.
he told us if we can, we should find the original graph published.

hope you can help me from the attachment graph.

 

[Molydood]

I used to run the bend in the 4x100 and although it feels faster, it isn't as quick as running in a straight line. Having said that it is unlikely that he will be able accelerate once he is onto the straight due to muscle fatigue. Top speed is likely to occur somewhere between 60m and 80m.

 

[Bob_for_short]

Suppose that during acceleration period he had a constant acceleration a for t₁ seconds. He reached the velocity v₁=a*t₁. He arrived at coordinate L₁= at₁²/2. Then he ran with v₁ the remaining time and covered L₂=200-L₁ for L₂/v₁ s. There are two unknowns: a and v₁ (or t₁), and there are two input data: L=L₁+L₂= 200m and T=19.3s, for example. Two equations for two unknown parameters suffice to find them.

 

[Molydood]

you need the splits from each 10 metre segment.
you can probably find these for 100m race but not sure about 200m. The other option is to analyse a video, but you need clear markers on the track and there may not be any.

 

[Borek]

100m is a google search away.

 

[HallsofIvy]

Well, this site:
http://www.elitefeet.com/usain-bolt-olympics-100-world-record
refers to him "easing up in the last 20 meters to pound his chest and gaze about"!

So, presumably, there should also be a sharp downard section at the end- he did not run through tape at full speed.

 

[Borek]

That's 100 meters, not 200 OP is looking for.