m=5 v1=450 v2=2.5 M=?
mv1=M*v2 M=m*v1/v2=5*450/2.5=900 кг
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m=5 v1=450 v2=2.5 M=?
mv1=M*v2 M=m*v1/v2=5*450/2.5=900 кг