Answer :
We have:
vi = initial velocity = 25 m/s
a = acceleration = 3 m/s^2
t =time = 3 s
vf = final velocity = ?
Apply:
[tex]a=\frac{(vf-vi)}{t}[/tex]Isolate vf
[tex]vf=at+vi[/tex]Replacing:
[tex]vf=3\text{ }m/s^{^2}(3s)+25m/s[/tex][tex]vf=34\text{ m/s}[/tex]Answer: 34 m/s