bantuu dong pkai faranya yaa

Fk . lk = W . lb
10 N . 2 m = 5 N . lb
20 = 5 . lb
lb = 20/5
lb = 4 m
Jawaban : C

Catatan :
Fk = gaya kuasa (N)
lk = lengan kuasa (m)
W = Berat benda (N)
lb = lengan beban (m)