Question

If the angle between two vectors a and b is 120°. If |a|=2, |b|=1 is

Answer 1

Answer:

I hope you wanted the resultant.

Resultant=√[(a)^2+(b)^2+2abcos∆]

= √[1+4+{2*1*2*(-1/2)}]

=√[5-2]

=√3

Hope it helps you!!!