Question

The length of vector joining the points A and B with position vectorsv`( 3hati + 2 hat j+ hatk )&( hati +hatj+hatk)`?

Answer 1

Given position vectors

`vecA=3hati + 2 hatj+ hatk` & `vecB= hati +hatj+hatk`

The length of vector joining the points A and B will be

`abs(vecA-vecB)=abs((3-1)hati + (2-1) hatj+ (1-1) hatk)`

`=sqrt(2^2+1^2)=sqrt5`