question_answer

The vector that must be added to the vector \[\hat{i}-3\hat{j}+2\hat{k}\] and \[3\hat{i}+6\hat{j}-7\hat{k}\] so that the resultant vector is a unit vector along the y­­-axis is

A)            \[4\hat{i}+2\hat{j}+5\hat{k}\]

B)                                      \[-4\hat{i}-2\hat{j}+5\hat{k}\]

C)            \[3\hat{i}+4\hat{j}+5\hat{k}\]                                         

D)  Null vector