15
FIT100
The Speed of Change
Consider running a mile …
*How fast can anyone run a mile?
•In
1999 Hakim El Guerrouj ran it in 3:43.13
*Compare with Roger Bannister
•In
1954 Bannister ran a mile in 3.59.4
*Express speed
as a
rate:
•In 45
years the mile run got 7% faster
Bannister’s rate = 15.04
mph
El Guerrouj’s rate = 16.27
mph