No. 20.. Please.. butuh cepat...
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ktotal = 5 + 5 = 10 N/m
setelah itu diseri sehingga
1/ktotal = 1/10 + 1/5
ktotal = 10/3 N/m
pertambahan panjang pegas p3 = m.g/k
= 5.10/ (10/3) = 50 . 3/10 = 15 cm = C