Question

Find the magnitude of resultant vector if the angle between two vectors and are

(i) 0º​

Answer 1

Answer:

A and B

Explanation:

If A and B are two vectors with an angle (theta) between them, then

(A+B).(A+B)=A^2+2A.B +B^2.

Now, left hand side is |A+B|^2 and on the right side ,A.B=|A||B| cos (theta). Therefore ,

|A+B|=[ A^2+2|A||B| cos (theta) +B^2 ]^1/2. This is magnitude of resultant ( sum ) of vectors A and B.