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m=40kg
m(2)=400kg
V=72km/h= 7200m/360s=20m/s
P-m*V
P(1)=40*20=800kg * m/s
P(2)=400*20=8000kg* m/s
zad.2
p=m*V
p(1)=4*30=120kg*m/s
p(2)=4*108=432kg*m/s
Ciało o predkosci 109m/s osiagnie wiekszy ped.