Question

the angle between a and b is 0 then angle between 2a and -3b is​

Answer 1

Hey MATE!!!

Vector*scalar = Same vector and in same direction

Now since we multiply a by 2 ,so it has effect on its magnitude and not on its direction .

But we have multiplied b by negative integer so direction becomes opposite of previous.

Therefore, the 2 vectors now make an angle of 180° with each other.

Hope it helps :))