Exam-style question
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If two vectors A and B are at right angles to each other, how do you calculate the magnitude of the resultant vector?.
- A.A + B
- B.A - B
- C.A^2 + B^2
- D.A^2 - B^2
Model answer
What a good answer should say
- A^2 + B^2
Explanation
Why this works
When two vectors are at right angles, the magnitude of the resultant vector R can be calculated using Pythagoras' theorem: R = √(A^2 + B^2).
Common mistake
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