Answer:
A: not more than the square root of a^2 + b^2.
Step-by-step explanation:
The magnitude of the resultant vector when two vectors are added is equal to the square root of the sum of the squares of the magnitudes of the individual vectors. This means that the magnitude of the resultant vector is equal to the square root of (a^2 + b^2). This means that the correct answer is option A: not more than the square root of a^2 + b^2.