Jawabanmu

2014-05-03T09:39:52+07:00
F = k Δx
20 = k Δx1
Δx1 = 20/k
50 = k Δx2
Δx2 = 50/k
Δx2/Δx1 = 50/k k/20

Δx2 = 2,5 Δx1