Jawabanmu

2014-05-02T18:50:19+07:00
M1 = 150 kg , t1 = 90 C , t2 = 10 C , tA = 40 C 
m1 . C . delta t1 = m2 . C . delta t2 
m1 . delta t1 = m2. delta t2 
150 ( 90-40) = m2 ( 40-10) 
150 . 50 = m2 . 30 
m2 = 250 kg

2014-05-02T21:57:01+07:00
Qlepas=Qterima m1x(T1-T)=m2x(T-T2) 150x(90-40)=mx(40-10) 150x50=mx30 750=30m 25kg.=m
seharusnya 150x50=7.500 jadi,7.500=30m 250 kg.=m