Final answer:
The addition of vectors does not necessarily result in a vector of greater magnitude as they can negate each other's effects. The direction of the resultant vector does depend on both magnitude and direction of the original vectors. Option B is correct.
Step-by-step explanation:
When considering whether the addition of five vectors results in a greater magnitude than that of any two vectors added together, the answer is not always straightforward. It is false that addition of more vectors always results in a vector of greater magnitude as the vectors can cancel each other out depending on their directions. As for the direction of the resultant vector, it indeed depends on both the magnitudes and directions of the original vectors, so that statement is true.
The ability to form a right-angle triangle with a vector and its components is also true, as this is the essence of resolving a vector into its perpendicular x and y components. Subsequently, the Pythagorean theorem can be used to calculate the magnitude of a resultant vector when two vectors are at right angles to each other; this statement is also true.
When only the angles of two vectors are known, without their magnitudes, it is not possible to accurately determine the angle of their resultant vector, thus that statement is false. However, if you know the magnitudes of two vectors and the angle between them, it is possible to calculate the magnitude and direction of their resultant, making that statement true.
The graphical addition of vectors can be done for any number of vectors, and its accuracy is limited only by the precision of drawing and measuring tools used, which makes the process both a flexible and precise method of vector addition.