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Lk.F = Lb. w
80F = 20 x 1200
F = 300 N
apa bila ditambah 100 N menjadi 300 N + 100 N = 400N
F = 400 N
misal digeser sejauh x, maka
Lk = 80 - x
Lb = 20 + x
Lk.F = Lb. w
400(80 - x) = 1200(20 + x)
------------------------------------- : 400
80 - x = 3(20 + x)
80 - x = 60 + 3x
4x = 80 - 60
x = 20/4
x = 5
jawaban :
(B) 5 cm menjauhi beban