[tex]dane: \\ \\ t = 6s \\ \\ a = 3 \frac{m}{ {s}^{2} } [/tex]
[tex]szukane: \ \ v[/tex]
[tex]wzor: \\ \\ a= \frac{v}{t} \ \ | \times t \\ v = a \times t[/tex]
[tex]obliczenia: \\ \\ \large{ v = 3 \frac{m}{ {s}^{ \not 2} } \times 6 \not s = 18 \frac{m}{s} }[/tex]
[tex]\boxed{\huge{v = 18 \frac{m}{s} }}[/tex]