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F=400N
t=10s
Δv=10m/s
szukane
m=?
F=m*a
m=F/a
a=Δv/t [a] =[m/s :s =m/s²]
a=10/10 =1 m/s²
m=400/1
m=400kg [m] =[N :m/s² =kg*m*s²/(m*s²) =kg]