So I took my calc 3 exam today and had this question
true or false
magnitude ( v+v) = 2*magnitude( v)
I put true.
Sorry, of course it's correct.
I was having a senile moment when I was imagining the two vectors weren't the same! D'oh!
Don't feel to bad about that. My first reaction was the same because I was expecting the question to read u+v since, in my opinion, that would have been a better question. Only after I started my reply did I realize the OP had v+v.
Did the same thing here.