Who is the fastest human being on Earth?

 In 2009, Jamaican sprinter Usain Bolt set a world record in the 100 meter sprint with a time of 9.58 seconds. For those of us more used to sitting than sprinting, to translate this feat into speed simply underscores the sublime nature of Bolt's performance.

Who is the fastest human being on Earth?

Speed ​​is the speed at which an object (or person) moves in time. It is mathematically represented as speed = d/t (where d is the distance and t is the time). That means Bolt's speed in his world record run was 10.44 meters per second. Since many people are more familiar with cars and speed limits, it may be more helpful to think of this in terms of km/hr or mph: 37.58 or 23.35, respectively. This is faster than the estimated average traffic speeds for the US cities of Boston, New York City, and San Francisco. Even more amazing is the fact that Bolt starts at zero speed and then has to accelerate, meaning that his top speed is actually faster.

In 2011, Belgian scientists used a laser to measure Bolt's performance in different stages of the 100-meter race held that September. They found that, entering the 67.13-meter race, Bolt reached a top speed of 43.99 km per hour (27.33 mph). He finished with a time of 9.76 seconds in that race, but research has shown that, given his body type, he probably shouldn't even be competing at that distance. From a biomechanical perspective, the fastest sprinters are relatively short and their muscles are equipped with fast-twitch fibers for rapid acceleration. The elite sprinter is a compact athlete, not a tall and thin person. Given his size—literally, head and shoulders higher than the other competitors—Bolt should be last off the block and last to the finish line. And he is the fastest man in the world.

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