Jawabanmu

2014-03-04T20:31:22+07:00
Q=mcΔt = 2 x 4200 x 50 = 42000 J = 42kJ

1 4 1
2014-03-04T20:33:59+07:00
Q = M x C x Δt
=2 x 4200 x 50 = 420 000 J / 420 KJ