Did Usain Bolt REALLY run 100m in 9.63 seconds?

  • Published on Aug 6, 2012
  • Usain Bolt won gold in the 100m sprint at the London Olympics, clocking 9.63 seconds... but Albert Einstein has something to say about all this?
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  • Science & TechnologyScience & Technology

Comments • 6 993

  • Luis Serene
    Luis Serene 4 days ago

    So does that mean if I m in bullet train therr will be the difference between my watches time and stations time

  • 3Vimages
    3Vimages 11 days ago


  • Patrick Kimani
    Patrick Kimani 26 days ago

    You remind me of my physics teacher. He was always imagining particles moving at speed v while others accelerating at the rate of dv/dt...

  • breadfan262
    breadfan262 Month ago

    The problem I have with a speed limit of c is that any speed has to be defined by a “fixed” reference point which is arbitrary

  • Miķelis Baltruks
    Miķelis Baltruks Month ago

    plot twist - stadium's clock was moving along the leader. So it showed the same as Usain's clock. So all of this is unnecessary! :D

    YASHI KANT Month ago

    What about light?? 💡 Think!😕

  • Scott Anderson
    Scott Anderson Month ago

    Gorillas run the 100 in nine flat

  • Me Playzz
    Me Playzz Month ago

    Thats almost 10 metres per second, wow, i cant even do 2 metres a second

  • Steve Wayne
    Steve Wayne Month ago

    the example of your car traveling at the speed of light towards the 70MPH car is misleading. Just because we accept that something cannot travel faster than light does not mean that speeds faster than light do not exist. The car traveling at the speed of light cannot go faster - agreed. The car going at 70MPH can go faster - and the closing speed between the 2 objects is the speed of light +70MPH. Neither car has exceeded the speed of light and neither car is traveling at the "closing speed" therfore your assertion that the closing speed cannot be SpeedOfLight+70MPH because nothing can travel faster than the speed of light is wrong. Besides, watch Star Trek - warp speed :)

  • Sharath Kumar
    Sharath Kumar Month ago

    Numberphile, I have a question. So, does this mean that if I move at the speed of light, time will basically stop for me? Or that space will shrink to nothingness? Please tell me, the question is killing me...

  • Guust
    Guust Month ago

    Don't forget the time it takes for the soundwaves from the starting gun reaching the ears of the runners and the time before the brain reacts to the signal of the ears. That time totals up to 0,15 seconds 👍🏅

  • John S
    John S 2 months ago

    If we are being this precise, then we would also have to include the fact that during the crossing of the finish line it took time for the light to travel from the (former) position of Usain Bolt to the camera, and that by the time the picture was being snapped, he had actually moved further. There is also the starting mechanism....

  • Trie Haryanto
    Trie Haryanto 2 months ago

    Don't understand what you described. I'd rather just run! 😂😂😂

  • Atraya Bajpai
    Atraya Bajpai 2 months ago +1


  • Justin T
    Justin T 2 months ago

    Got to go fast to stay young

  • Przemyslaw Sliwinski
    Przemyslaw Sliwinski 2 months ago

    What if we put a stadium clock a little higher?

  • Hiba Zreik
    Hiba Zreik 2 months ago


  • Yoda Yoda
    Yoda Yoda 2 months ago

    When you’re that bored...

  • zamazalotta
    zamazalotta 2 months ago

    i'm a simple guy, i see relativity in a numberphile video i hit that dislike button 👎👎👎
    maybe this would be interesting in a parallel universe, but not here...

  • RubyPiec
    RubyPiec 2 months ago


  • Colin Batchelor
    Colin Batchelor 2 months ago

    Way late here, and I'm only being technical because I have advanced experience in the subject, but just wanted to add all times in track (athletics) are rounded up to the next hundredths, so anything from 9.6201-9.6300 would be listed in the official results as 9.63.

  • Stu Pidas
    Stu Pidas 3 months ago

    But which direction was the the track? With or against the rotation of the earth? Sloppy sloppy!

  • Alex Rodriguez
    Alex Rodriguez 3 months ago

    What if the stadium clock read 9.637363837292919272

  • bhrugu rajput
    bhrugu rajput 3 months ago

    2:20 Jake Peralta ??

  • Raf Pacheco Reacts
    Raf Pacheco Reacts 3 months ago

    2:21 rare footage of adolf hitler screaming at his soldiers after they lost WWII

  • Sam Nasam
    Sam Nasam 3 months ago

    did he really run 100m?

  • Brad King
    Brad King 3 months ago

    The stadium clock is always rounded to nearest hundredth. So he could have ran a 9.625-9.629...

  • HappyBeezerStudios - by Lord_Mogul

    If he went slightly less then 100m in slightly less then 9.63 sec can't the extrapolate that he would've reached exactly 100m after exactly 9.63 sec?

  • Bob squash
    Bob squash 4 months ago

    Nah he jogged it

  • Fraud Samaritan
    Fraud Samaritan 4 months ago

    what do you mean track shrank?

  • Venkatesh babu
    Venkatesh babu 4 months ago

    Ratio of v square to c square meets the qualifiers of space exchange. The limiting factors.

  • BillNGX
    BillNGX 4 months ago

    Surely his watch would tell the time?

  • Paul George
    Paul George 5 months ago

    Nah he ran 9.58

  • James Latimer
    James Latimer 5 months ago

    He wears a cheap Rolex made in Japan

  • Tim Owen
    Tim Owen 5 months ago

    Surely a 0.2 second reaction delay would bring it down to 9.43 seconds of actual sprinting. Who cares about your nanoseconds? Leave that for the GPS satellites.

  • Mike Hunts
    Mike Hunts 5 months ago

    /\/ £ |2 |) $ ( |-| /-\ /\/ £ |_

  • CailloS
    CailloS 5 months ago

    NNEEEEEEERRRRRRRRRRRRDDD... jk.. but who cares? literally a really small fraction of a fraction of a second less than what he was recorded as...

  • opendebate
    opendebate 6 months ago +1

    This is what happen when a math guy trying to explain physics

  • Volty Nebu
    Volty Nebu 6 months ago

    No. He ran 9.58 seconds.

    • Starblind11
      Starblind11 4 months ago

      As was clearly stated in the video, he ran 9.63 at the London Olympics. You're referring to Berlin, which happened in a different year.

  • 911gp
    911gp 6 months ago +2

    Why so many thumbs down ?

  • raudh1
    raudh1 6 months ago


  • Barnie Smarny
    Barnie Smarny 6 months ago

    Since starting blocks were used in modern 100m races ,runners have their feet in the blocks maybe a metre or more from the line where its suitable to push off . because runners chose to use blocks they would be doing 100m's a fraction quicker too.

  • Zlatan Ibrahimovic
    Zlatan Ibrahimovic 6 months ago

    Two cars can both be going at c towards each other. The gap can close at 2c, because the gap isn't matter/energy. I assume I'm missing something?

    • Zlatan Ibrahimovic
      Zlatan Ibrahimovic 4 months ago

      Thanks for that. You're missing a reason. EDIT: I'm aware of the mistake I made, I'm just not sure you are.

    • Reg Kray
      Reg Kray 4 months ago

      you are missing a brain

  • Davis Robinson
    Davis Robinson 6 months ago

    The answer is no, he didn't, because he beat that time and ran it in 9.58

  • PhotographyJo- Taj Alami
    PhotographyJo- Taj Alami 6 months ago +1

    That's a waste of time

  • gian fernandez
    gian fernandez 6 months ago

    But me can run 1 km in 3.1415926535897932384626433832795028841971693993751058209747445923078164

  • Emrah Ekinci
    Emrah Ekinci 6 months ago

    Maybe the Stadium Clock DID show 9.6299...99442 but rounded up for us layman and it showed 9.63 ? You ever thought about that ? No .. you just started spewing out your theory of S.R. stuff around ! :D

  • Yanick Willert
    Yanick Willert 6 months ago

    or the stadium clock just rounded up...

  • West Yorkshire
    West Yorkshire 6 months ago

    You dont have to change what you think because majority of people agree your wrong

  • Lita León M.
    Lita León M. 7 months ago

    what is wrong with you people!? this is a very interesting channel that makes videos about MATHEMATICS, not clickbaits like the ones all of you are used to. RESPECT!!

  • nisse26a
    nisse26a 7 months ago

    naught naught naught naughty

  • jim jimjim
    jim jimjim 7 months ago

    Where is your chin?

  • M Lion
    M Lion 7 months ago

    This guy is the exact type of guy who would argue with the cashier at McDonald for giving him 1 less fry than the average amount.

  • TheToucanCommander
    TheToucanCommander 7 months ago

    First we care about about some laundry square, now we care about 0.000000000005 seconds? What next, the colour of someone’s eyes?

  • cormac king
    cormac king 7 months ago

    What about his 9.58?

  • Its_manuel 04
    Its_manuel 04 7 months ago

    I like this guy

  • Bulletless
    Bulletless 7 months ago

    I want to die now who can be so sad to acc do this

  • #IHateRappers #ProudCatOwner #IEatPussy

    Wait but for track i did a 100m and finished in 11 seconds, theres no way usian bolts only 2 seconds faster than me.

  • Patrick DeStefano
    Patrick DeStefano 7 months ago

    It was actually 9.58

  • ram suresh
    ram suresh 7 months ago

    Wtf Mr.Einstein ...why did you make life so hard and complicated for many of us students ??

  • Ewan Green
    Ewan Green 7 months ago


  • Bargain Bin Gaming
    Bargain Bin Gaming 7 months ago

    Police are milliseconds away when nanoseconds matter.

  • FrenzzyLeggs2006
    FrenzzyLeggs2006 7 months ago

    What do I do with this knowledge

  • Zsamalao
    Zsamalao 8 months ago +1

    He ran it in 9.58

    • Pinkhorse FBI
      Pinkhorse FBI 3 months ago

      Zsamalao different year, it was the 2012

  • Srivatsa Bolisetti
    Srivatsa Bolisetti 8 months ago

    give me a like

  • Trash_Noob_Skrub :D
    Trash_Noob_Skrub :D 8 months ago

    why am i watching this im like 6 years old

  • Jason Li
    Jason Li 8 months ago

    What the hell’s an American billion? I know they don’t use the metric system, but I didn’t know they had different numbers.

    • Reg Kray
      Reg Kray 4 months ago

      Well you know now

  • Kauan R. M. Klein
    Kauan R. M. Klein 8 months ago

    If he'd run 10 seconds at the speed of light (according to the stadium's clock), how much time passed would his clock display?

    • Reg Kray
      Reg Kray 4 months ago

      no time would have passed

  • Egil Sandnes
    Egil Sandnes 8 months ago

    Naughty number at 1.57

  • David KP
    David KP 8 months ago +1


    • Pinkhorse FBI
      Pinkhorse FBI 3 months ago

      David KP that was a different Olympic

  • Mr.Butler
    Mr.Butler 8 months ago

    Why would this be relevant

  • Honza Halek
    Honza Halek 8 months ago

    no, if he had a watch, it would not show that time you said because the stadium clock is not even slightly this accurate and even if it was, the time 9:63 is obviously rounded very much so the very little difference that special relativity makes does not affect what is or would be on the clock.

  • Max Kobzar
    Max Kobzar 8 months ago

    I'm 100% sure that he's a virgin

  • Talha ŞAHİN
    Talha ŞAHİN 8 months ago


  • RabidChimpmunk
    RabidChimpmunk 8 months ago

    What kind of watch you got that reads that far boi

  • TalMojo
    TalMojo 8 months ago

    Despite if this is true, your telling me that the resolution of his clock was a billionth of a second, uhhh I don't think so.

  • Kyle Merson
    Kyle Merson 8 months ago

    Respect bro

  • Magic Rojava
    Magic Rojava 8 months ago

    Here we go... a cheater.

  • Chillvgaming
    Chillvgaming 8 months ago

    Its just the click their is adding it up to 9:63 bevares it ddosent matter

  • Dehan Badenhorst
    Dehan Badenhorst 8 months ago

    The 8k dislikes are unintelligent beings.

  • its_n
    its_n 8 months ago

    I’m slow asf and run mine in 15 seconds 😂

  • James Green
    James Green 8 months ago

    Well they round it

  • Skettles
    Skettles 8 months ago

    I thought i was the only one that thought "NEIN NEIN NEIN NEIN NEIN"

  • Kai Na
    Kai Na 8 months ago

    It's like this guy doesn't have much teaching skills

  • Kai Na
    Kai Na 8 months ago

    In Spanish a billion is 1,000,000,000,000
    We say "one thousand million" for 1,000,000,000

  • Simon McCutchen
    Simon McCutchen 8 months ago


    Time travelers

  • Running Nigerian
    Running Nigerian 8 months ago

    Well if you want to know how fast he actually ran the 100m you have to minus his reaction time before he starts running and the amount of time the sound of the gun takes to reach his ears.

  • Oddis220
    Oddis220 8 months ago


  • Legit Homie
    Legit Homie 8 months ago


  • Philipp K
    Philipp K 8 months ago +1

    and according to usain bolts view of perspective and special relativities length contraction he would not have travelled 100m exactly, THEREFORE THE TITLE IS WRONG. correct me if im wrong i only passed 1 semester of physisc in university yet

  • Ayo Ilagan
    Ayo Ilagan 8 months ago

    So he did run it in 9.63

  • Micah Graham
    Micah Graham 8 months ago

    Who cares? It was rounded to the nearest hundredth

  • kevin brown
    kevin brown 8 months ago

    One problem: Yes, they saw him end later than he actually did, but they also saw him start later than he actually did. So basically, they were right, and you are just thinking it through way too much.

  • Hugh-John Fleming
    Hugh-John Fleming 8 months ago

    Reaction time. He covered the distance in considerably less time.

  • Fancy Filmers
    Fancy Filmers 8 months ago

    whos watching in 2018!!!

  • Alexander Marshall
    Alexander Marshall 8 months ago

    No. He ran 100 metres in 9.58 seconds.

    • Starblind11
      Starblind11 4 months ago

      Not in London 2012, which they clearly refer to.

  • Rahman Bayne
    Rahman Bayne 8 months ago

    but we learn to round up :)

  • Tarheel Trusty23
    Tarheel Trusty23 8 months ago

    No one cares

  • Some random person
    Some random person 8 months ago

    But... since the clock doesn't show that many places... if it was actually 9.620000000000005 according to the clock, then he did run it in 9.63 seconds. :P

  • Luke Riha
    Luke Riha 8 months ago

    No one cares