As per your syllabus, eqn 3.14, the magnitude of a vector A = A_x î + A_y ĵ is which expression?
AA_x · A_y
B√(A_x² + A_y²)
CA_x + A_y
D(A_x + A_y)²
Answer & Solution
Correct answer: B. √(A_x² + A_y²)
syllabus eqn 3.14: A = √(A_x² + A_y²).
Pythagoras on the perpendicular components.
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