m₁*g - Fн = m₁*a
Fн - m₂*g = m₂*a
m₁*g - m₂*g = m₁*a + m₂*a
m₂*a + m₂*g = m₁*g - m₁*a
m₂*(g + a) = m₁*(g - a)
m₂ = m₁*(g - a) / (g + a)
m₂ = 400 г * (10 м/с² - 2 м/с²) / (10 м/с² + 2 м/с²) = 400 * 8 / 12 ≈ 270 г
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m₁*g - Fн = m₁*a
Fн - m₂*g = m₂*a
m₁*g - m₂*g = m₁*a + m₂*a
m₂*a + m₂*g = m₁*g - m₁*a
m₂*(g + a) = m₁*(g - a)
m₂ = m₁*(g - a) / (g + a)
m₂ = 400 г * (10 м/с² - 2 м/с²) / (10 м/с² + 2 м/с²) = 400 * 8 / 12 ≈ 270 г