Jawabanmu

2014-06-06T17:13:14+07:00
A. Q = m . c . T
       = 2 . 4200 . 80
       = 67200 J
2014-06-06T17:24:21+07:00
A. q= m. T.c
= 2.80.4200
=67200

b.t=q/c
=67200/4200
=16