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KCET2008MathematicsVector Algebra

The projection of a =3 i - j +5 k on b =2 i +3 j + k is

Options

  1. A8 35
  2. B8 39
  3. C8 14
  4. D14

Correct answer

C. 8 14

Step-by-step solution

Given, a =3 i - j +5 k and b =2 i +3 j + k The projection of a on b = a b | b | = (3 i - j +5 k ) (2 i +3 j + k ) 2²+3²+1² = 6-3+5 14 = 8 14

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