Write a unit vector in the direction of the sum of the vectors 
and 
Let 
be the sum of the vectors 
⇒
⇒
⇒
|
| = (42 + 32 + ( - 12)2)1/2
⇒|
| = (16 + 9 + 144)1/2 = (169)1/2 = 13
a unit vector in the direction of the sum of the vectors is given by:
Ans:
1