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m₁= 1kg
t₁= 90°C
m₂= 2 kg
t₂= 60°C
Dit= ta
Jwb=
Q₁=Q₂
m₁.c.Δt=m₂.c.Δt
m₁.(t₁-ta)=m₂.(ta-t₂)
1.(90-ta)=2.(ta-60)
90-ta=2ta-120
3ta= 210
ta=70°C