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If |p̅ (s)| is a non-zero constant, then direction of  is:
  • a)
    perpendicular to direction of p̅(s).
  • b)
    parallel to direction of p̅(s).
  • c)
    always makes acute angle with p̅(s).
  • d)
    it can have any direction.
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
If |p (s)| is a non-zero constant, then direction ofis:a)perpendicular...
Concept Used:
For any vector , there are two parts one is the direction and the other is magnitude.
For a constant vector the direction as well as magnitude both remains constant.
And the direction of the zero vector is arbitrary.  
Calculation:
| p̅ (s)| is a non-zero constant,
Hence, Its derivation must be zero.
, i.e., zero vector.
Hence, it must have an arbitrary direction. i.e., it can have any direction.
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If |p (s)| is a non-zero constant, then direction ofis:a)perpendicular to direction of p(s).b)parallel to direction of p(s).c)always makes acute angle with p(s).d)it can have any direction.Correct answer is option 'D'. Can you explain this answer?
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