e) We want to know bolts actual velocity ( not average velocity) at the half-way point of the race (at 50 m). Why can we not get this number from the information in the table?

f) Give two different approximations of Bolt's velocity at th 50 meter point, and explain how you arrived at each approximation.

g) What information would we need in order to compute Bolt's velocity at the 50 meter point? This is an open ended question that could have various correct answers.