Taking into account the definition of speed, it takes her 400 s to win the race.
First of all, the speed is a magnitude that relates the change in position (or displacement) with time. That is, the concept of speed is associated with the change in position of a body over time.
The expression for the speed calculation is equal to the quotient between the space traveled and the time elapsed:
[tex]speed=\frac{displacement}{time}[/tex]
In this case, you know:
- speed= 2 [tex]\frac{m}{s}[/tex]
- displacement= 800 m
- time= ?
Replacing in the definition of speed:
[tex]2 \frac{m}{s} =\frac{800m}{time}[/tex]
2 [tex]\frac{m}{s}[/tex]× time= 800 m
time= 800 m÷ 2 [tex]\frac{m}{s}[/tex]
time= 400 s
In summary, it takes her 400 s to win the race.
Learn more:
- brainly.com/question/13803208?referrer=searchResults
- brainly.com/question/20725831?referrer=searchResults
