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m2=2kg
t1=90 derajat
c=4200 j/kg
dit suhu campuran
hit :m1+m2=7kg
q=m.c.t1
=7.4200.90
=2646000
t2=m.c/q
=7.4200/264000
=29400/2646000
=0,01
maaf low salah