I'm in gr. 12 physics right now(just started school today), and we started some review work. This is a new school, so I'm guessing some of the things taught by the different teahers vary, which explains why I don't understand this question. Here's the question word for word, there's also a small amount of information before the question, which I'll also post: The vector subtraction A - Bis defined as the vector addition of A and -B, where -B has the same magnitude as B, but is in the opposite direction. Thus A- B = A + (-B). Ex 4. Given that A = 35m/s [27 degrees N of E] and B = 47 m/s [E], determine the change in velocity C = A - B. Now, I'm only a high school physics student, but the way I know to calculate a change in velocity is v_2 - V_1. This question threw me off completely, and I have no idea what I should do. The only thing I came up with, was this, and I'm sure it's wrong, but I'll post it anyway: C = A - B = 35 - 47 = -12 Therefore the change in velocity is -12 m/s. I don't think this can be right. Number one, the velocity is increasing from A to B, so I don't think the answer should be negative. And number two, this says nothing about the change in direction, only speed. Someone please help soon, thanks in advance.