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Answer: Option a 5 Newton
Vector sum depends on angle
For least angle 0 degree both vector are in same direction so add the forces
If we add two forces = 11+5= 16 N
For highest angle 180 degree the vector is in opposite direction so subtract it
If we subtract two forces = 11-5= 6 N
So the answer must be between 6N and 16N only option a violates which is less than 5
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