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+1 vote
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in Vector algebra by (57.5k points)
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What vector must be added to the sum of two vectors 2 i -­ j + 3k and 3 i ­- 2 j ­- 2k so that the resultant is a unit vector along Z-­axis 

  1. 5 i + k 
  2. - 5 i + 3 j 
  3. 3 j + 5k 
  4. - 3 j + 2k

1 Answer

+1 vote
by (63.7k points)
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Best answer

Correct Answer:2. -5 i + 3j

Explanation :

Equating the components. 

5 + x = 0 , x = - ­5 

y ­- 3 = 0 , y = 3

1 + z = 1 , z = 0 

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