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F1 = 49 N
Δx1 = 8cm = 0,08 m
Δx2 = 6cm = 0,06 m
Dit: F2....?
F1/Δx1 = F2/Δx2
49/0,08 = F2/0,06
F2 = (49x0,06)/0,08
F2 = 2,94/0,08
F2 = 36,75 N
Kita cari nilai K terlebih dahulu
gaya = k • perubahan panjang
49N = k • 0.08m
k = 612.5 N/m
lalu tinggal cari gaya untuk merenggangkan 6cm
gaya = k • perubahan panjang
= 612.5 • 0.06
=36.75N