Jawabanmu

2014-05-11T20:22:43+07:00
Q lepas = Q terima
m.c.Δt = m.c.Δt
m.4200.(t1-tc)=12.4200.(tc-t2)
m.4200.(95-35)=12.4200.(35-25)
m.4200.60=12.4200.10
252000.m=504000
m=504000/252000
=2 kg