Answer: 5.5 m/s
Explanation:
As we are told the runner accelerates at a constant rate, we can use the following equation:
[tex]V_{f}=V_{o} + at[/tex]
Where:
[tex]V_{f}[/tex] is the runner's final velocity
[tex]V_{o}=1.9 m/s[/tex] is the runner's initial velocity
[tex]a=1.2 m/s^{2}[/tex] is the runner's constant acceleration
[tex]t=3 s[/tex] is the time it takes the runner to reach the final velocity
[tex]V_{f}=1.9 m/s +(1.2 m/s^{2})(3 s)[/tex]
Finally:
[tex]V_{f}=5.5 m/s[/tex]
