Question

the angle between avector abd bvector is 0 then angle between 2abar and -3bbar

Answer 1

Hey.

Here is the answer.

The angle between the given A and B vectors is zero.

So angle between there unit vectors or Abar and Bbar vector will also be zero.

And hence angle between 2 Abar - 3Bbar or
2Abar +(-3Bbar) will also be 0° or π if direction get reversed due to - ve sign as magnitude like 2 and 3 don't affect angle only - sign does.

Thanks.