Question

Calculate the acceleration of Usain Bolt in first 4 seconds​

Answer 1

This shows Usain with an average speed of 5.38 m/s at a time of 0.91 seconds and 9.83 m/s at 2.35 seconds. From this, I can calculate the average acceleration (during this interval) to get a value of 3.09 m/s2. Race data also show that Bolt sprang from the starting blocks with an acceleration of 9.5 meters per second squared—that's almost 0.97 g, the acceleration due to Earth's gravity—and was churning out a whopping 2.6 kilowatts of power (3.5 horsepower) less than 1 second later.