F₂ = F₄ = 18Н
F = F₃ - F₁ = 20 - 12 = 8Н
F = ma
a = F / m = 8 / 2 = 4 м/с²
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F₂ = F₄ = 18Н
F = F₃ - F₁ = 20 - 12 = 8Н
F = ma
a = F / m = 8 / 2 = 4 м/с²