If \(\vec{r}\) = \(\frac{9\vec{a}+7\vec{b}}{16}\) then the point P whose position vector \(\vec{r}\) divides the line joining the points with position vectors \(\vec{a}\) and \(\vec{b}\) in the ratio……….
A. 7 : 9 internally
B. 9 : 7 internally
C. 9 : 7 externally
D. 7 : 9 externally
Answer:A
If \(\vec{r}\) = \(\frac{9\vec{a}+7\vec{b}}{16}\) then the point P whose position vector \(\vec{r}\) divides the line joining the points with position vectors \(\vec{a}\) and \(\vec{b}\) in the ratio……….
A. 7 : 9 internally B. 9 : 7 internally C. 9 : 7 externally D. 7 : 9 externally