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m1 = 500 gram = 0,5 kg
t1 = 90 C
m2 = 2 kg
t2 = 30 C
Ditanyakan : tC ?
Dijwab :
tC = (m1t1) + (m2t2) / (m1+m2)
= ((0,5x90) + (2x30))/ (0,5+2)
= (45+60)/2,5
= 105/2,5
= 42 C