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T2= 100C
T2 = 10C
TC = 40C
M1 ..?
Jwb : Qserap = Qlepas
M1..c1.(TC-T1) =m2.c2.(T2 -TC)
M1.(40-10)= 2 (100-40)
M1.30 = 2(60)
M1= = 4kg