Question

two equal forces have their resultant equal to either.what is the inclination between them?​

Answer 1

Let ? be the angle between the two vectors A and B such that, |A| = |B|.

Therefore,

R 2 = A 2 + B 2 + 2AB cos?

=> A 2 = A 2 + A 2 + 2(A)(A) cos? [since, |A| = |B| = |R|]

=> A 2 = 2A 2 + 2A 2 cos?

=> cos? = -1/2

=> ? = 120 0