9. Usain Bolt set the world indoor track record in 2009 by running 100 m in 9585.What was his average speed? (1)

Usain Bolt's average speed can be calculated using the formula:<br /><br />Average Speed = Distance / Time<br /><br />Distance = 100 meters<br />Time = 9.58 seconds<br /><br />Average Speed = 100 m / 9.58 s <br />Average Speed ≈ 10.44 m/s<br /><br />So, Usain Bolt's average speed was approximately $\boxed{10.44 \text{ m/s}}$.<br />