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a=F/m
m1=4kg
m2=8kg
m3=m1+m2
m3=4kg+8kg
m3=12kg
F1=20N
F2=8N
F-wypadkowa = F1-F2
F-wypadkowa = 12N
a=F/m
a=12N/12kg
a=1N/kg
[N]=kg*m/s-kwadrat
a=1m/s-kwadrat