Р=F/A
F=mg=400 кг×9,8 м/с^2 = 3920 Н
Р=3920Н/2м^2 = 1960 Па
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Р=F/A
F=mg=400 кг×9,8 м/с^2 = 3920 Н
Р=3920Н/2м^2 = 1960 Па