Questions 1. The acceleration, according to equation (18-1), is the change in velocity per unit time. If the time is in seconds it tells us the change in velocity per second. Therefore, If a car accelerates 5 m's" this means that its velocity increases 5 mis each second. As an object falls by how much does its velocity increase each second? 2. Why did we use only the odd dots to determine the velocities and then plot them at times corresponding to even dots