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Q lepas = Q serap
m₁ x c x ΔT₁ = m₂ x c x ΔT₂
m₁ x ΔT₁ = m₂ x ΔT₂
150 x (90 - 40) = m₂ x (40 - 10)
150 x 50 = m₂ x 30
m₂ = (150 x 50) / 30
m₂ = 250 kg
Jadi, massa air dingin adalah 250 kg