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0,2 gram = 200 kg
Q =m.c.Δt
12000 j =2,5 kg. 200 . Δt
12000 j = 500 Δt
Δt = 12000
_______
500
Δt = 24
Δt = t2-t1
24 = t2 - 30
24 + 30 = t2
54 =t2