Jawabanmu

2014-05-08T19:23:49+07:00
Pakek rumus Q : m.c. perubahan suhu (delta t)
20 x 4200 x 50 : 420000
2014-05-08T19:24:52+07:00
Q = m*c*Δt
  = 2*4200*50
  = 420000 Joule