How Usain Bolt Can Shave 0.13 Seconds Off His 100m Time (Using Maths)

How Usain Bolt Can Shave 0.13 Seconds Off His 100m Time (Using Maths)

Usain Bolt is a hero: he can run 100m in 9.58 seconds flat. But a mathematician thinks that — without any extra effort — he can shave another 0.13 seconds off his time. Here’s how.

John Barrow, a mathematician at the University of Cambridge, has been analysing Bolt’s running, and has found three factors that could help him save the time:

  • Reaction Time: Barrow points out that Bolt is cautious out of the blocks. In fact, when he set his record in Berlin in 2009, he was the second slowest starter off the line, taking 0.146 seconds to get moving compared with 0.119 seconds for the speediest starter. So, if Usain can put aside worries of a false start, and trim his reaction time to 0.13 seconds, he’d get his time down to 9.53 seconds.
  • Wind Assist: Bolt’s current record was scored with a modest tail wind of just 0.9m/s. Barrow has calculated that if the maximum allowable tailwind occurred — which is 2m/s — he’d save a further 0.05 seconds taking his time down to 9.48 seconds.
  • Height Advantage: Finally, if he ran the race at 1000m altitude — but no higher, otherwise his performance would drop — he should be able run faster due to lower wind resistance. That change could see him chop 0.03 second off his time, taking it down to an ridiculous 9.48 seconds.

Sadly, the Olympics in London take place at sea level, meaning that the final time-saver is out of the question for now. But if he can manage the first two, we could see him hit a time somewhere around 9.5 seconds. And that is truly lightning fast. [Significance via New Scientist]

Image: AP Photo/Thomas Kienzle