If the resultant of two vectors each of magnitude F is also of magnitude F, the angle between them is:
Correct answer: C. 120 degrees
- A. 60 degrees
- B. 90 degrees
- C. 120 degrees
- D. 130 degrees
Explanation
R²= A² +B² + 2 AB cos βPutting R = A=B = f, we get β = 120°
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About Addition of Vectors
Vector addition combines directed quantities using the head-to-tail, parallelogram and component methods. Work includes finding the resultant magnitude and direction for two or more vectors, resolving vectors into perpendicular components, and distinguishing vector addition from scalar addition, where direction has no role.
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