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Q = 84 kj = 84000 J
m = 500 g = 0,5 kg
c = 4200 J/kg°c
T1 = 20°c
t = ?
rumus = t = Q : m×c
t = 84000J : 0,5kg × 4200J/kg°c
t = 84000 : 2100
t = 40 °c
t2 = t1 + t
t2 = 20 °c + 40°c
t2 = 60°c