Question

The unit vector parallel to resultant of vectors A=4i+3j+k And B=-i+3j-3k is ?​

Answer 1

Explanation:

We have a+b=(4i+3j+k)+(-i+3j-3k)

=3i+6j-2k

Therefore |a+b|=√(3^2+6^2+(-2)^2)

|a+b|=√49=7

Hence a unit vector parallel to (a+b) is a+b/|a+b|

=3i+6j-2k/7=1/7(3i+6j-2k)