Question

Question #fc58a

Answer 1

Let there be two vectors

`vecP=ahati+bhatj+chatk`

and

`vecQ=ehati+fhatj+ghatk`

Their resultant will be

`vecR=vecP+vecQ=(a+e)hati+(b+f)hatj+(c+g)hatk`

Let `(a+e)=x ;(b+f)=y and (c+g)=z`

So

`vecR=xhati+yhatj+zhatk`

So unit vector parallel to the resultant will be

`hatr=(vecR)/abs(vecR)=(vecR)/sqrt(x^2+y^2+z^2)`