Correct Answer: Option D

Explanation

\(F = F\cos\theta + F\sin\theta\)

\(\implies 90N = 90\cos 120° + 90\sin 120°\)

\(120N = 120 \cos 240° + 120 \sin 240°\)

\(R = F_{1} + F_{2} \)

= \((90 \cos 120 + 120 \cos 240)i + (90\sin 120 + 120 \sin 240)j\)

= \(90(-0.5) + 120(-0.5))i + (90(\frac{\sqrt{3}}{2}) + (120(-\frac{\sqrt{3}}{2}))j\)

= \(-105i - 15\sqrt{3}j = -15(7i + \sqrt{3}j)\)

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