Question

The resultant of two forces equal in magnitude is equal to either of two vectors in magnitude. Find the angle between the forces.

• A. (a) 60°
• A. (b) 45°
• A. (c) 90°
• A. (d) 120°

Answer 1

(d)

F = $F = \sqrt{F^{2} + F^{2} + 2F^{2}\cos\theta}$ or

cosθ = - 1/2 ; θ = 120⁰