1. The problem statement, all variables and given/known data Given a position time graph and velocity time graph for 1 cycle of an oscillating pendulum, if the curve for velocity passes through 0 m/s, can you say that velocity at that point is zero, even though there are no times in the position-time graph where the graph is a straight line? 2. Relevant equations Velocity = displacement / time Instantaneous velocity = slope of tangent on position time graph = displacement / time 3. The attempt at a solution This is just a general physics question. Basically the graph for the pos - time graph is a bell curve and velocity time graph is a basic sine function. I was thinking that I could the INSTANTANEOUS velocity is zero at that point, but not the average. I'm not sure if that is correct, but it makes sense since it is at a certain point in time. Since the position time graph is a bell curve, could I say that relevant to the starting position, since the finishing position is at the starting, that there is no displacement and therefore velocity is 0, even though the position time graph is a curve and not a horizontal line?