1. The problem statement, all variables and given/known data If the object is not thrown straight up or down, is there any point along the path where the velocity and acceleration vectors are parallel to each other? 2. Relevant equations 3. The attempt at a solution I know that velocity would be positive, but while moving upwards, wouldn't the acceleration be negative because the ball is slowing down (neg acc and positive v=slowing down)? And vice versa for going down. At the peak, velocity and acceleration would be perpendicular because there is no vertical velocity at that point, and acceleration would be facing downwards.