The world record for the 100m sprint, held by Usain Bolt, is 9.58 seconds.

With this information alone, i.e. without using extra information about the accuracy of Olympic sprint track timing and distances, which of the following is the correct statement about his average speed and its uncertainty?

Hint I: The average speed can be calculated from v = d/t.

Hint II: For given data where no other uncertainty information is provided, a reasonable estimate of the uncertainty will generally be:

            ½ (last significant figure)

This means that you should take the distance to be d = 100.0 ± 0.5 m and the time to be t = 9.580 ± 0.005 s.

Hint III: Refer to the section on combining uncertainties in the Guide to Experimental Work.