Two vectors of same magnitude have a resultant equal to either of the two vectos. The angle between two vectors is

Step-by-step solution

This is an important result to remember. Two vectors at 120 degree produce a vector equal to their magnitude. Let their magnitude be a, array l Resultant =a= (a²+a²+2 a a ) =a (2+2 ) =- 1 2 =120⁰ array