Question

The vector A and B are such that A+B =A-B The angle between the two velocity is

Answer 1

Explanation:

Let the angle between two vectors AandB be θ

So

|A+B|2=|A|2+|B|2+2|A||B|cosθ

Again

|A−B|2=|A|2+|B|2+2|A||B|cos(180−θ)

By the given condition

|A+B|=|A−B|

So

cosθ=cos(180−θ)

⇒θ=180−θ

⇒θ=90∘