Question

Two equal forces have their resultant equal to either of them . Find the angle b/w two vectora

Answer 1

Let theta be the angle between the two vectors A and B

Where |A|=|B|

R^2= A^2+B^2+ABcostheta

A^2= A^2+A^2+2(A) (A) costheta

Costheta = -1/2

=120°