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WAEC Further Mathematics 2026 Question 26

Question 26

Vectors

Find the unit vector in the direction of r = 5i − 2j

  1. A.(5i + 2j)/√21
  2. B.(5i − 2j)/√21
  3. C.(5i − 2j)/√29
  4. D.(5i + 2j)/√29
Show the answer and explanation

Answer: C ((5i − 2j)/√29)

Explanation

|r| = √(25 + 4) = √29, so the unit vector is r/|r| = (5i − 2j)/√29.