The velocity of Usain Bolt

Usain Bolt ran the fastest ever officially timed 100 meter race at the 2009 World Athletics Championships in Berlin, finishing in 9.58 seconds. You can watch the race here:

Watch the race

Thanks to some modern technology, the location of Bolt as a function of time during the race is known relatively accurately, and that information is available to you using the special "Boltify" button. To find Usain Bolt's location (in meters from the starting line) at the 2009 Athletics World Championships 100m final, enter the time in seconds after the starting gun and click "Boltify":



Using this information, your job is to complete the following assignment.

1) Determine Usain Bolt's average velocity for the race.
2) Determine Usain Bolt's instantaneous velocity (in m/s) at t=5s, accurate to three decimal places.
3) Roughly what was Bolt's maximum velocity during the race (in m/s)?
4) What is this velocity in km/hr?