Two forces F1 and F2 ifF1is double that ofF2 and the resultant is perpendicular on F1 then the angle betwee them is

Question

Expain ans with reason and diagram

Answer 1

Imagine that F₂ is along the x-axis, F is along y-axis,
and F₁ is directed to the “north-west”.
The angle between F and F₁ is α.
sin α = F₂/ F₁=1/2
α=30°
Thus, the angle between F₁ and F₂ is
90°+30° = 120°

Answer 2

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