The present human footspeed record was set in 2009 by Jamaican sprinter Usain Bolt. What speed did he reach?

Question

When the women's 5000 m world record was broken by a 17 year old in 1984 (with a time of 15:01.83), why was the new record not accepted by the International Amateur Athletics Federation (IAAF)?

Answer 1

44.725 km/h (27.79 mph)
The figure is the average rate Bolt set between the 60 and 80 meter distance of a 100 m sprint in the IAAF World Championships in Athletics, Berlin. He covered the 20m distance in 1.61 seconds. The 37.58 km/h speed was Bolt's time for the full 100 m. The rate of 48 km/h is a sprint measured for a domestic cat.