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v1=0 m/s
s= 20 m
a=?
a=(v1-v2)/t -> t=v/a -> t²=v²/a²
s=at²/2 -> t²=2s/a
2s/a=v²/a² /*a²
2*s*a=v²
a=v²/2*s
a=10*10/(2*20)
a=100/40
a=2,5m/s²
Opóźnienie wynosiło 2,5m/s²