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F₁ = 5 N, F₂ = 10 N
R yang tidak mungkin ??
Jika F₁ dan F₂ mengapit sudut α, untuk 0º ≤ α ≤ 180º, maka nilai R mungkin berada antara selang
|F₂ - F₁| ≤ R ≤ |F₂ + F₁|
|10 - 5| ≤ R ≤ |10 + 5|
5 ≤ R ≤ 15
Jadi nilai R tidak mungkin
● R < 5 N
●R > 15 N ← jwb [d]