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450.l=75 . 1.5
l=75 . 1.5/450
l=0.25m atau 25 cm
w = 450 N
F = 75 N
lk =1,5 m
Penyelesaian:
lk/lb = w/F
lk.F = lb.w
1,5.75 = 450lb
lb = 112,5 : 450
lb = 0,25 m = 25 cm (a)