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to = -15 derajat celcius
c = 2100j/kg
m = 1,2 kg
Q = m x c At
31,5 = 1,2 x 2100 x t+15
t+15 = 31,5/2520
t+15 = 0,0125
t = 0,0125 - 15
t = -14,98 derajat celcius