• # question_answer The vector projection of a vector $3\hat{i}+4\hat{k}$on y-axis is                                                        [RPMT 2004] A)            5     B)            4 C)            3     D)             Zero

As the multiple of $\hat{j}$ in the given vector is zero therefore this vector lies in XZ plane and projection of this vector on y-axis is zero.