Question

Find the unit vector for the vector =2i - j+2k​

Answer 1

Explanation:

Ans:

Given

a=2i-j+2k

b=-i+j-k

a+b=(2i-j+2k)+(-i+j-k)=i+k

MOD(a+b)=SQRT(1^2+1^2)=SQRT(2)

So unit vector in the direction of a+b=(a+b)/MOD(a+b)

= i+k/SQRT(2)