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lietrka ro = q zelaza = 7800 kg/m(sześcienny)
q=m przez V / :V
m=q*V
m=7800kg/m(sześcienny) * 0,4 m(sześcienny) = 31200 kg
F= m*g
f=3120kg * 10 n na kg = 31200n = 31,2 KN