Two equal vector have a resultant equal to either of them, then the angle between them will be:

A. `120^(@)`

B. `90^(@)`

C. `60^(@)`

D. `0^(@)`

A. `120^(@)`

B. `90^(@)`

C. `60^(@)`

D. `0^(@)`

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Correct Answer – D

Let `F_(1)= F_(2) = F` be forces them , `F_(2)= 2F`

`F_(R)= sqrt(F_(1)^(2) + F_(2)^(2) + 2F_(1)F_(2) cos theta)`

`(2F)^(2) = 2F^(2)+ 2F^(2) costheta `

`cos theta =1`

`theta = 0^(@)`