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maaf kalo salah :)
w x lb = F x lk
90 N x 1m = F x 2 m
F = 90 x 1/2
F = 45 N
atau cara kedua
lb/lk = w/F
1m/2m = 90 N/F
F = 90 x 1/2
F = 45 N
jadi jawabannya 45 N