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m = 1,2 kg
c = 2100 J/Kg
T1 = -15 C
t2 ... ?
Q=m.c.delta T
31500 = 1,2 . 2100 . deltaT
31500 = 2520 . delta T
delta T = 31500 / 2520
= 12,5
delta T = t2 - t1
12,5 = t2 - (-15)
12,5 = t2 +15
t2 = 12,5 - 15 = -2,5