Question

If A and B are two vectors such that |A+B| = 2|A-B|, the angle between A and B is:
a. 450 b. 600 c. 300 d. data insufficient.

Answer 1

Explanation:

|A+B| = 2|A-B|

→A^2+B^2 + 2AB cos theta =2A^2 + 2B^2 -4ABcos theta

→A^2 + B^2 -6ABcos theta =0

After this we can't solve

Hence , data is insufficient .