Question

If the magnitude of sum of two non zero vectors is

equal to the magnitude of their difference, then

which of the following is true?

(1) Two vectors must have equal magnitude

(2) Angle between two vectors must be 90°

(3) Two vectors have equal magnitude but

oppositely directed

(4) Angle between the vectors must be, 120°
​

Answer 1

the ans is 2

angle between them is 90