Question

the unit vector along i + j is

Answer 1

Hi dr, gud mrng. .....

Unit vector along ( i + j) is ( i + j)/| i + j|
|i + j | is magnitude of ( i + j)
we know,
i and j are perpendicular to each other
So, |i + j| = √(i² + j² + 2.I.j.cos90°)
= √( 1 + 1) = √2
hence, unit vector along (i + j) is (i + j)/√2

HOPE THIS HELPS.....♥♥

Answer 2

unit vector is vector/magnitude
=
$\frac{(i + j)}{ \sqrt{2} }$

hope you get it. :)