1. The problem statement, all variables and given/known data Car A is traveling a distance d behind Car B. Initically both cars are traveling at the same speed of 20.02 m/s. Suddenly Car B applies the brakes, causing Car B to decelerate at 3.05 m/s2. It takes the driver of Car A 0.75 seconds to react, and when she applies her brakes Car A decelerates at 3.658 m/s2. What is the initial minimum distance d between the cars so as to avoid a collision? 2. Relevant equations xf = xi + vix*t +(1/2)axt2 vfx = vix + ax*t [itex]\Delta[/itex]x = vix*t -(1/2)axt2 3. The attempt at a solution For Car B I found the final x position: xf = 0m + 20.02m/s(.75s) +(1/2)(-3.05m/s)(.75s^2) = 14.157 m And then because velocity for Car A in those .75 seconds is constant a=0. So: [itex]\Delta[/itex]x = (20 m/s)(.75s) = 15 m But then I'm not exactly sure what those 15m from Car A is.