Question

if the resultant of two vectors each of magnitude of 'F' is also 'F' then the angle between them will be​

Answer 1

Answer:

Ф = 120°

Explanation:

Let P→and Q→ are two vectors of equal magnitude of value x and R→ is their resultant, then

P→=x, Q→=x ∴ R→=x

∵R²= P²+Q²+2PQcosθ

∴x²=x²+x²+2x²cosθ

or cosθ=1/2

∴ θ=120°

Hope it helps!