Various variables can affect the speed of a runner like Wind, Altitude, Reaction time, Temperature and humidity, Spikes, etc.
WIND: When there is a headwind, you will lose 12 seconds per mile, and when there is a tailwind, you will gain 6 seconds per mile.
ALTITUDE: At higher altitudes, Due to the drop in oxygen partial pressure and the insufficient supply of oxygen for oxidative metabolism, you will run 8 to 30 seconds slower every mile.
REACTION TIME: When it comes to responding to stimuli in circumstances, a quick reaction time enables us to be quick and effective.
TEMPERATURE AND HUMIDITY: The average pace looks to be around 1 minute per mile faster during the winter than during the summer, showing a significant variation in performance. High humidity also slows down the pace of a runner.
SPIKES: An athlete can run more quickly by using spikes by accelerating faster, reaching their top speed faster, and running more efficiently.
These are the main factors that every athlete should keep in mind while running in the 100-yard dash.
Learn more about humidity here: brainly.com/question/28179822
#SPJ9