Which of the following is true

Two collinear vectors are always equal in magnitude. Two vectors having same magnitude are collinear Two collinear vectors having the same magnitude are equal \(\vec{a}\) and \(\vec{-a}\) are collinear

\(\vec{a}\) and \(\vec{-a}\) are collinear

Note that \(-\vec{a}=(-1)\vec{a}\) so \(\vec{a}\) and \(-\vec{a}\) are collinear.