1. The problem statement, all variables and given/known data Prove that when speed is constant that V(T), and A(T) are perpendicular. 2. Relevant equations I know this involves the dot product to show that the dot product of the vectors is zero. 3. The attempt at a solution In my head I thought that since the speed is constant that there must be no acceleration. When I dot the zero acceleration vector to the velocity vector it is zero, but I am thinking that there is no way this can be right.