Two forces of magnitude 12 N and 8 N are acting at a point. If the angle between the two forces is 60°, the magnitude of the resultant force is

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\\F_R = \sqrt{A ^2 + B ^ 2 + 2 AB \cos \theta }\\\\= \sqrt{12 ^2 + 8 ^ 2 + 2\times12\times8\times \cos60 }=\sqrt{144+64+96}=\sqrt{304}\\\\=17.44N

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