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m= 2kg
delta T = t2-t1
t2=25
t1=5
delta T=25-5=20
c= 4200 j/kg
maka
Q=m * c* delta T
= 2*4200*20
=168000 J
semoga membntu Dan maaf kl salah
= 2 x 4200 x 20
= 168000J = 168kj