Jawabanmu

2014-05-09T20:36:18+07:00
 Q lepas = Q terima
m1.c.ΔT1 = m2.c.ΔT2
(karena c nya sama, maka c hilang)
m1.(T1-Ta) = m2.(Ta-T2)
2.(100-40)=m2.(40-10)
2.60=m2.30
120=30m2
120/30=m2
4 kg = m2