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Q lepas = Q terima
m₁ c air ΔT = m₂ c air ΔT
coret yang sama
m₁.ΔT = m₂.ΔT
100. (80-Tc) = 200 (Tc-20)
80-Tc = 2 (Tc-20)
80-Tc = 2Tc - 40
tukar tempat
2Tc - 40 = 80-Tc
2Tc+Tc = 80+40
3 Tc = 120
Tc = 120/3
= 40°C