Vector Addition for Resultant Force

Steps:

• Two 2N forces yield a 4N resultant only if parallel and in the same direction, as magnitudes add directly.
• Use parallelogram law: resultant magnitude is maximum (4N) when angle between forces is 0°.
• Compare diagrams: look for arrows aligned end-to-end in one direction.
• Confirm B shows collinear, same-direction forces summing to 4N vector.

Why B is correct:

• B depicts forces in the same direction, so resultant = 2N + 2N = 4N per vector addition rule.

Why the others are wrong:

• A: Forces oppose (180°), resultant = 0N by cancellation.
• C: Forces at 90°, resultant = √(2² + 2²) = 2√2 N ≈ 2.8N < 4N.
• D: Forces at obtuse angle, resultant magnitude < 4N by cosine rule.

Final answer: B