$\text{Dane:}$  

$\text{a}=1,5\frac{\text{m}}{{\text{s}}^2}$  

$\text{Szukane:}$  

$\text{v}=\text{?}$  

Przekształcamy wzór na przyspieszenie ciała: 

$\text{a}=\frac{\text{v}}{\text{t}}\text{/}\cdot \text{t}$  

$\text{a}\cdot \text{t}=\frac{\text{v}\cdot \sout{\text{t}}}{\sout{\text{t}}}$  

$\text{v}=\text{a}\cdot \text{t}$  

Kolejno podstawiamy czas (co 2 sekundy aż do 20 sekund):

${\text{v}}_0=0\frac{\text{m}}{\text{s}}$  

${\text{v}}_1=\text{a}\cdot {\text{t}}_1=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 2\text{s}=3\frac{\text{m}}{\text{s}}$  

${\text{v}}_2=\text{a}\cdot {\text{t}}_2=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 4\text{s}=6\frac{\text{m}}{\text{s}}$  

${\text{v}}_3=\text{a}\cdot {\text{t}}_3=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 6\text{s}=9\frac{\text{m}}{\text{s}}$  

${\text{v}}_4=\text{a}\cdot {\text{t}}_4=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 8\text{s}=12\frac{\text{m}}{\text{s}}$  

${\text{v}}_5=\text{a}\cdot {\text{t}}_5=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 10\text{s}=15\frac{\text{m}}{\text{s}}$  

${\text{v}}_6=\text{a}\cdot {\text{t}}_6=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 12\text{s}=18\frac{\text{m}}{\text{s}}$  

${\text{v}}_7=\text{a}\cdot {\text{t}}_7=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 14\text{s}=21\frac{\text{m}}{\text{s}}$  

${\text{v}}_8=\text{a}\cdot {\text{t}}_8=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 16\text{s}=24\frac{\text{m}}{\text{s}}$  

${\text{v}}_9=\text{a}\cdot {\text{t}}_9=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 18\text{s}=27\frac{\text{m}}{\text{s}}$  

${\text{v}}_{10}=\text{a}\cdot {\text{t}}_{10}=1,5\frac{\text{m}}{{\text{s}}^2}\cdot 20\text{s}=30\frac{\text{m}}{\text{s}}$  

t [s]	0	2	4	6	8	10	12	14	16	18	20
v [m/s]	0	3	6	9	12	15	18	21	24	27	30