Answer: 5.
- A 5
- B 7
- C 25
- D 1
Correct answer: A. 5
Explanation: Magnitude = √(3² + 4²) = √25 = 5.
Triangle law of vector addition: placing vector b at the head of vector a, the diagonal from the start to the final head gives the resultant a + b.
Concept context
Vectors, dot product, cross product, and geometric applications