Answer: 10/√6.
- A 10/√6
- B 10/6
- C √6
- D 5/√6
Correct answer: A. 10/√6
Explanation: Projection = (a·b)/|b| = (2 + 6 + 2)/√6 = 10/√6.
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