Question

The position vectors of A and B are $\mathbf { i } - \mathbf { j } + 2 \mathbf { k }$ and $3 \mathbf { i } - \mathbf { j } + 3 \mathbf { k }$ The position vector of the middle point of the line AB is

• A. $\frac { 1 } { 2 } \mathbf { i } - \frac { 1 } { 2 } \mathbf { j } + \mathbf { k }$
• B. $2 \mathbf { i } - \mathbf { j } + \frac { 5 } { 2 } \mathbf { k }$
• C. $\frac { 3 } { 2 } \mathbf { i } - \frac { 1 } { 2 } \mathbf { j } + \frac { 3 } { 2 } \mathbf { k }$
• D. None of these

Answer 1

Answer: (B)

$2 \mathbf { i } - \mathbf { j } + \frac { 5 } { 2 } \mathbf { k }$

Answer 2