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ρ = 920 kg/m³
Fw = 0,58 N
Fw = ρ*g*V
V = Fw/ρ*g
V = 0,58 / 920* 10 = 6,3 * 10⁻⁵ m
V = a³ -> a = ∛V = 0,018 m = 0,04 m
Odp. krawędź kostki wynosi 4 cm