Answer to Question #241555 in Mechanics | Relativity for Babani

Question

Show that vector A,B and C weither they are coplanar or not.

Answer 1

If three vectors A, B and C are coplanar then these must follow the condition

$(\vec{A}\times\vec{B}).\vec{C} = 0$

As cross product of two vectors will give a vector perpendicular to plane containing these vectors. Dot product of two perpendicular vectors is zero. So above condition is necessary.