Question

If a = 2m-n and b = -m +n , find the magnitude of c = 3a + 2b where m and n are two vectors inclined at 60°.

Answer 1

Answer:a^2 +b^2 =c^2.

Explanation:

square of magnitude of first vector + square of magnitude of second vector + twice the dot product of the two vectors whose sum's magnitude is to be found.