Question

answer the question #####

Answer 1

Hi...

|A-B| = sqrt.(|A| + |B| - 2|A||B|cos60o) ----- eq. 1

As A and B are unit vectors...they both have magnitutde equal to 1

Now putting the values in eq. 1

|A-B| = sqrt.(1+1-1)


we get sqrt(1) which is qual to 1

Hence the answer is (b) 1

Hope this helps u!!