Jawabanmu

2014-05-23T19:21:42+07:00
W = 100 N
F = 20 N
lb = 0,4 m
lk = ??

w. lb = f.lk
100.0,4 = 20.lk
40 = 20lk
lk = 40 : 20
lk = 2 m
Mungkin begini kalo gk salah