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m1*v1=m2*v2
dane;
m pocisku=5kg
v pocisku=200m/s
m kuli=20kg
v kuli=?
5kg*200m/s=20kg*v kuli
v kuli=5kg*200m/s/20kg
v kuli=20 m/s
odp; v kuli wynosi 20m/s ;)