Resultant force magnitude depends on angle between vectors

Steps:

• Use vector addition formula: R = √(3² + 4² + 2·3·4·cosθ) for angle θ between forces.
• When θ = 0°, cosθ = 1, R = √(9 + 16 + 24) = √49 = 7 N (maximum, forces aligned).
• When θ = 90°, cosθ = 0, R = √(9 + 16) = √25 = 5 N (minimum, forces perpendicular).
• For 0° ≤ θ ≤ 90°, R varies continuously from 5 N to 7 N; values below 5 N impossible.

Not enough information: Diagram not provided to identify specific R shown, but based on angle range, possible values are 5–7 N.

Final answer: B. 5N