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F1 = 20 N
R1 = R
R2 = 2R
ditanyakan :
F2 = ?
jawab:
F2/F1 = (R1/R2)²
F2/20 = (R/2R)²
F2/20 = 1/4
F2 = 1/4 x 20
F2 = 5 N