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m = 5 kg
c = 4200 J/kg°C
T1 = 20° C
T2 . . . ?
Q = mc delta T
delta T = Q/mc
delta T = 21000 J/5 kg . 4200 J/kg°C
delta T = 21000 J/21000 J/°C
delta T = 1 °C
T2 = T1 + delta T
T2 = 20° C + 1° C
T2 = 21° C