Question

The magnitude of the X and Y components of vector A are 7 and 6. Also the magnitudes of X and Y components of vector (A + B) are 11 and 9 respectively. What is the magnitude of vector B ? 

1. 5 
2. 6 
3. 8 
4. 9

Answer 1

Correct Answer: 1. 5

Explanation :

Equating components. 

7 + x = 11 

x = 4 

6 + y = 9 

y = 3 

z = 0 ; z = 0