1. The problem statement, all variables and given/known data "Two cars drive on a straight highway. At time t = 0, car 1 passes mile marker 0 traveling due east with a speed of 20.0 m/s. At the same time, car 2 is 1.0 km east of mile marker 0 traveling at 30.0 m/s due west. Car 1 is speeding up with an acceleration of magnitude 2.5 m/s^2, and car 2 is slowing down with an acceleration of magnitude 3.2 m/s^2. Write x-versus-t equations of motion for both cars" 2. Relevant equations The equation I used was X = Xi + ViT + 1/2 AT^2 Sorry, I'm bad at typing these equations without subscripts or superscripts. 3. The attempt at a solution I got the equation right for Car 1. However, when I went to solve for Car two, it did not match with the answer key. I plugged in all of the relevant information into the equation: X = 1000m + (-30 m/s)t + 1/2(3.2 m/s^2)t^2 = 1000m + (-30 m/s)t + (1.6 m/s^2)t^2 Since Car 2 is going towards the 0 marker, the velocity should be zero. However, in order for there to be deceleration, accerleration and velocity should have opposite signs. Since velocity is negative, I made acceleration positive. However, this doesn't match the textbook answer, which is X = 1000m - (-30 m/s)t - (1.6 m/s)t^2 Am I doing something wrong? Thanks in advance for taking the time to answer my question!