Yes, true
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It is a vector whose magnitude is 1.It is a vector whose magnitude is 1.It is a vector whose magnitude is 1.It is a vector whose magnitude is 1.
Vectors are often represented by arrows whose length is proportional to the magnitude of the vector. The arrowhead points to the direction the vector is acting. You'll have to decide if such an arrow fits your definition of a line.
The unit vector is a vector whose magnitude is 1.
No, it's a scalar measurement because it has magnitude only. A vector measurement has both a magnitude and a direction.
NULL VECTOR::::null vector is avector of zero magnitude and arbitrary direction the sum of a vector and its negative vector is a null vector...