A vector `vecF_(1)` is along the positive `X`-axis. If its vectors product with another vector `vecF_(2)` is zero then `vecF_(2)` could be

Answer

`2sqrt(19), tan^(-1) ((3sqrt(3))/7)`

Explanation

`|vec(A)-vec(B)|=sqrt(A^(2)+B^(2)-2AB cos theta)`
`=sqrt((10)^(2)+(6)^(2)-2(10)(6)cos 60^(@))=2sqrt(19)`
`tan alpha=(6 sin 60^(@))/(10-6 cos 60^(@))=(6xxsqrt(3)//2)/(10-3)=(3sqrt(3))/7`
`rArr alpha=tan^(-1) ((3sqrt(3))/7)`