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dit : 120 kkal = ... J
jwb : 120 kkal = 120 x 1000 = 120000 kal
120000 kal = 120000/0,24 = 500000 J
jadi 120 kkal = 500000 J
Jadi, tinggal 120 x 4,2= 504 J.
Semoga membantu!