Coplanar vectors all occur in the same:

Coplanar vectors are defined as vectors that lie within the same geometric plane. This means that they can be represented on a two-dimensional surface without any component extending outside of that plane. When discussing coplanar vectors, it is essential to recognize that although they may have different magnitudes and directions, they all share a common plane.

For example, vectors that represent forces acting on a flat surface, such as forces applied to a table, are coplanar because they all exist within the same two-dimensional plane formed by the table's surface. Understanding this concept is crucial in various applications, including physics and engineering, where vector analysis is necessary for solving problems.

In contrast, the other options relate to different characteristics of vectors. Velocity pertains to the speed and direction of an object, which does not imply anything about the plane in which the vectors lie. Magnitude refers to the length of a vector, indicating how strong or large it is, but again does not relate to the plane concept. Direction signifies the line along which something moves or points, but vectors can have different directions and still be coplanar.