Forces F₁ = (3i + 2j) N and F₂ = (i - 4j) N act on a particle. Find the magnitude of the resultant force.
A$2\sqrt{5}$ NCORRECT
B$4\sqrt{5}$ N
C$2\sqrt{10}$ N
D$4\sqrt{2}$ N
GCEFurther MathematicsVectors2019
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Resultant R = F₁ + F₂ = (3+1)i + (2-4)j = 4i - 2j. |R| = √(16 + 4) = √20 = 2√5 N.
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