Jawabanmu

2014-04-24T17:15:42+07:00
Q1=Q2
m . c . delta t = m . c . delta t
m . delta t = m . delta t (c sama shg dicoret)
4 . (35-25) =  m . (85-35)
4 . 10 = m . 50
40 = 50m
m = 40/50 = 0,8 kg
2014-04-24T17:19:36+07:00