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The magnitude of the zero vector is zero, hence the name.
the end point
The direction of a vector is defined in terms of its components along a set of orthogonal vectors (the coordinate axes).
Yes, a vector can be represented in terms of a unit vector which is in the same direction as the vector. it will be the unit vector in the direction of the vector times the magnitude of the vector.
The zero vector is both parallel and perpendicular to any other vector. V.0 = 0 means zero vector is perpendicular to V and Vx0 = 0 means zero vector is parallel to V.