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Δ t = 20 ° c
c = 4200 j / kg ° c
m.c. Δ t
0,5 . 4200 .0,5 = 42000 j = 42 kj
42 kj + 48 kj = 90 kj
menurutku itu jwbnya
48.000J=4200.0,5.20
48.000J=2100.20
48.000J=42000J
90000J