Jawabanmu

2014-05-08T21:59:23+07:00
Q = m . c . ( t2-t1 )
72000 J = 5kg . c . ( 20 - 14 )
72000 J = 5kg . c . 6
72000 J = 30 . c
72000/30 = c
2400 = c

jadi kalor jenisnya 2400 / C

semoga membantu :)