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Δt= t akhir-t awal
Q=kalor
m = massa
c=kalor jenis = 390 aja ya..
t=suhu
jadi
20000 J= 0,5kg.390.(T akhir-20*c)
20000 = 195.(Ta-20)
20000 = 195 Ta - 3900
20000+3900= 195 Ta
195 Ta = 23900
Ta = 23900/195
Ta = 112,56... * c
insya allah, coba tunggu jawaban lain