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Hukum kekekalan energiP. t = m.c.∆t
1200.7(60) = m.4200.(100-20)
1200.420 = m.4200.80
504000 = 336000.m
m = 504000 : 336000
m = 504 : 336
m = 1,5
jadi, massanya adalah 1,5 kg.
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