Final answer:
Usain Bolt's average speed during his 2009 world-record 100-meter dash was approximately 10.4 meters per second, calculated by dividing the distance by the time (100 m / 9.58 s).
Step-by-step explanation:
In 2009, Usain Bolt set the world record for the 100-meter dash with a time of 9.58 seconds. To find his average speed in meters per second, we use the formula for average speed which is the total distance traveled divided by the total time taken. The distance for the record was 100 meters.
Using the formula we get average speed = total distance / total time = 100 m / 9.58 s which equals approximately 10.4 m/s. This speed represents how fast Usain Bolt was going on average throughout the 100-meter dash.