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a=2m/s²
wzór= s=1/2at²
a=v/t
rozwiązanie;
400m=1/2*2m/s²*t²
400m=m/s²*t²
400s²=t²
t=20s
2m/s²=v/20s
2m/s²*v=20s
v=10m/s
odp; prędkość wynosi 10m/s;)