Two forces of magnitude $F$ have a resultant of the same magnitude $F$. The angle between the two forces is ........ $^o$
$45$
$120$
$150$
$60$
Two forces of magnitude $F$ have a resultant of the same magnitude $F$. The angle between the two forces is ........ $^o$
$F = \sqrt {{{(F)}^2} + {{(F)}^2} + 2F.F\cos \theta } $
$⇒$ $\theta = 120^\circ $
$⇒$ $\theta = 120^\circ $
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