Question

Write the vector of magnitude 9 units in the direction of vector 2i+j+k

Answer 1

firstly calculate the magnitude of the unit vector.
it is √(4+1+1)=√6 .
now we need to multiply such a no. to its magnitude so that it becomes 9.
Here, we'll multiply (9/√6) to the unit vector
hence the answer is (2î+j+k)×9/√6