Jawabanmu

2014-04-10T15:43:01+07:00
2/5*336k=67.2k 2/5*50*4200=84k 84k+67.2k=151.2k
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2014-04-10T16:02:32+07:00
Qtotal= Qab+Qbc+Qcd
           0.4x2100x5+0.4x336000+0.4x4200x50=
           4200+134400+84000= 222600 J = 222,6 kJ
Semoga benar jawabanku :))
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