Define unit vector, null vector and posi-tion vector .

Define unit vector, null vector and position vector .

Define null vector.

Define (i) unit vector (ii) null vector (iii) cross product of two vectors vec A and vec B .

Equal vectors; null vector; unit vectors; position vector; like and unlike vectors; collinear and parallel vectors

What is null vector ?

What is a null vector ?

Define a vector and a unit vector. Find in terms of vector vec(a) a unit vector in its direction.

What is a null vector?