Question

the angle between two vector of equal magnitude is 120 degree​

Answer 1

Answer:

Explanation:

Hope  it helps you!!!!!

R =A +B

where R is the vector sum of A⃗  and B⃗ .

R2=R .R =(A +B ).(A +B ).

R2=A .A +B .B +2A .B  

R2=A2+B2+2A .B  

Now A=B=R

R2=R2+R2+2R2cosθ

cosθ=−12

which gives

θ=120