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V =20m/s
t =2s
F =?
v= a x t
a = V/t
F = a x m
F = (V /t) x m
F = (20m/s /2s) x 1000kg
F = 10 000kgm/s² = 10 000N
1kN = 1000N
F = 10kN
Δp=p-0=p=mv=F*t /zmiana pędu=popęd siły
F=mv/t=20000kg*m/2s²=10000N=10kN /siła