How fast usain bolt run mph

Live Science has some great comparisons with animals' speed. That hardly negates the fact my jaw will be firmly placed on the ground after what is sure to be some amazing sprints from Usain Bolt and his swift colleagues. Follow gabezal. Enjoy our content? Join our newsletter to get the latest in sports news delivered straight to your inbox!

The first is air resistance, or drag, the opposing force acting on each leg as it tries to push the body forward. The second property at play, which does increase with greater mass, is called inertia, the resistance of an object to accelerate from a state of rest. This is especially limiting for larger animals—with more mass to push forward, it's harder to overcome inertia.

So smaller bodies have the advantage here. A house cat this size could run up to 46 miles per hour; a giant spider, if its legs could somehow sustain its weight, would top out at 35 miles per hour. Unsurprisingly, the average human body design comes in last place here: At kilograms, we can only reach about 24 miles per hour.

In the model, leg length also mattered. He's the world record holder in the and metre sprints. Those numbers only show Usain Bolt's average speed.

They don't show his maximum speed. Luckily, when Usain Bolt set his current world record at the Berlin World Championships, the International Association of Atheletics Federations collected lots of data. The data on Usain Bolt showed that he reached at top speed of Cheetahs are the fastest land animals, with a top speed of 72 miles per hour. That's faster than the speed limit on UK motorways!

Will Usain Bolt beat his own world record again? We'll have to wait until the metre final on August 5 to find out. Who is the fastest man on Earth? Usain Bolt, right? The unpopular answer is, in fact, Justin Gatlin. In , he ran the metres in 9. Nevertheless, no-one has ever been recorded to run faster from a stationary start on the flat — although some sub-world record times have also been clocked for people running down hill.

For most other track athletes, wind is anathema. When Roger Banister looked out of the window on the morning of May 6 , for example, he almost decided to postpone his attempt to break the four-minute mile record because it was too windy.