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F = 5N
alpha = cos 60°
ditanya = R?
jawab =
R = √F₁² + F₂²- 2 . F₁ . F₂ . cos 60
R = √5² + 5² - 2 . 5 . 5 . ½
R = √25 + 25 - 2 . 25 . ½
R = √25 + 25 - 2 . 12,5
R = √25 + 25 - 25
R = √25
R = 5 N