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ρ=0,9 g/cm³=900kg/m³
V=2m x 7m x 0,7m=9,8m³
m=900kg/m³×9,8m³
m=8820kg
v=2m*7m*0.7m=9.8m=9800000m
m=d*v
m=9800000*o.9g=8820000g=8820kg