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m1*v1=m2*v2
dane;
m1=15g
v1=800m/s
m2=?
v2=4m/s
podstawiamy do wzoru;
15g*800m/s=m2*4m/s
m2=15g*800m/s/4m/s
m2=3000g
dop; masa karabinu wynosi 3000g;)