Final answer:
True. If the angles of two vectors are known, we can use the Law of Cosines to find the angle of their resultant addition vector.
Step-by-step explanation:
True.
If the angles of two vectors are known, we can use the Law of Cosines to find the angle of their resultant addition vector. The Law of Cosines states that the square of the length of a vector equals the sum of the squares of the lengths of the two vectors minus twice the product of their lengths and the cosine of the angle between them. By rearranging the equation, we can solve for the angle. For example, if the angles of the two vectors are 30 degrees and 45 degrees, we can find the angle of their resultant vector.