Find the unit vector in the direction of the sum of the vectors, ( ve – McqOptions

MCQOPTIONS

1.	Find the unit vector in the direction of the sum of the vectors, ( vec{a} )=2 ( hat{i} )+7 ( hat{j} ) and ( vec{b} )= ( hat{i} )-9 ( hat{j} ).
A.	( frac{3}{ sqrt{11}} hat{i}- frac{2}{ sqrt{11}} hat{j} )
B.	( frac{2}{ sqrt{13}} hat{i}- frac{3}{ sqrt{13}} hat{j} )
C.	( frac{3}{ sqrt{11}} hat{i}+ frac{2}{ sqrt{13}} hat{j} )
D.	( frac{3}{ sqrt{13}} hat{i}- frac{2}{ sqrt{13}} hat{j} )
Answer» E.

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