Question

If the magnitude of resultant vector of two vector of equal magnitude each equal to F is also F than the angle between tge vector is

Answer 1

Answer:

See..The Resultant Is Given as Root(A^2+B^2+2.A.B.Cos.Theta) (where theta is The angle Between the two vectors)

Now pay attention to this...Cos 60 is 1/2...Now Cos 120 will be -1/2...(ASTC) rule..

So If A=B=F..

Resultant vector=Root(F^2+F^2+2.A.B.Cos(120°)

=Root(2F^2+2F^2(-1/2)]

=Root(2F^2-F^2)

=Root(F^2)

=F

Thus The angle should Be 120°..This is the required answer..

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