V/2=4м*0.3м*0.25м/2=0.15м3
F=rgV/2=1000кг/м3*9.8Н/кг*0.15м3=1500Н=1.5кН
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V/2=4м*0.3м*0.25м/2=0.15м3
F=rgV/2=1000кг/м3*9.8Н/кг*0.15м3=1500Н=1.5кН