1. The problem statement, all variables and given/known data Prove the following statement K = (a(t) * N(t)) / (llv(t)ll)2 To clear things up it is the dot product of a(t), and N(t). Divided by the magnitude of velocity squared. 2. Relevant equations llV X All / llV(t)ll3 3. The attempt at a solution I used the cross product identity to get llAll ll V Sin(θ). I canceled a V on the top, and bottom. I am left with A(t) * 1. I am wondering if I can changed that to N(t) since it has a length of one, or do I need to something else?