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When the magnitude of the resultant of two vectors is equal to the sum of the magnitude of two vectors?


The resultant of two vectors is equal to the sum of the magnitude of two vectors, if two vectors are like parallel vectors. The nature of resultant vectors is same as that of the given vectors. 
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Is vector addition associative?

Yes, vector addition is associative. 
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What is the magnitude of difference of the two unit vectors?

Magnitude of difference of two unit vectors lies between 0 and 2. 
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Is vector subtraction associative? 

No, vector subtraction is not associative. 


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Can commutative law and associative law be applied to vector subtraction?

Commutative law and associative law cannot be applied to vector subtraction. 
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