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m2=0.02kg
v1=?
v2=700m/s
v1=m2*v1 : m1
v1=0.02kg* 700m/s : 5kg
v1=14 m/s : 5kg
v1=2.8 m/s
Odp; Karabin odskoczy prędkością 2.8 m/s.
Licze na naj ;]