Since you give no indication of any directions,
without loss of generality, we can say that A = 5i
So, since A•B = -5, we can say that B = -i + bj where 1+b^2 = 2^2, so b=√3
B = -i+√3 j
Now you just need the unit vector in the direction of A+B.
|A|= 5, |B|=2,, The angle between A and B is 120. Determine the unit vector in the direction of |A+B|.
I don't know what to even do. I tried but idk pls help!!
3 answers
Okk thanks alott
I found the unit vector as
1/√19|A+B|. Does that seem correct
I found the unit vector as
1/√19|A+B|. Does that seem correct
yess.