Vector Addition for Resultant Force

Steps:

• Identify that two 2N forces yield a 4N resultant only if they act parallel and in the same direction, as R = F1 + F2.
• In a scale diagram, this appears as two arrows aligned end-to-end, totaling 4 units of length.
• Compare options: B shows aligned arrows matching 4N scale.
• Confirm by parallelogram rule: no angle deviation for maximum resultant.

Why B is correct:

• When forces are collinear and same direction, resultant magnitude is vector sum (2N + 2N = 4N) per Newton's vector addition law.

Why the others are wrong:

• A: Arrows oppose, resultant 0N (subtraction).
• C: Arrows at angle (e.g., 90°), resultant ~2.8N (√(2² + 2²)).
• D: Arrows at obtuse angle, resultant <4N but >0N.

Final answer: B