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F1 = F2 = 20 N
α = 120
R = ?
arahnya = ?
R^2 = F1^2 + F2^2 + 2.F1.F2. cos 120
R^2 = 20^2 + 20^2 + 2.20.20(-0,5)
R^2 = 400 + 400 - 400
R^2 = 400
R = √400
R = 20 N
Arahnya
sin β = F2. sin 120 / R
sin β = 20.0,8660 / 20
sin β = 17,32 / 20
sin β = 0,866
β = arc sin 0,866
β = 60⁰
arahnya tinggal