1. The problem statement, all variables and given/known data Speedy Sue, driving at 30m/s, enters a one way tunnel. She observes a slo-moving van 155m ahead traveling at 5m/s. Sue applies her brake and accelerates at 2m/s. Will there be a collision? If yes, determine how far into the tunnel and at what time. If no, determine the distance of closest approach between Sue's car and the van. 2. Relevant equations V1 = 30m/s V2 = 5m/s x = 155m a= -2m/s2 3. The attempt at a solution I attempted to make Δxsue = Δxvan. I used Δx = Vot + 1/2 at2. I combined like terms and tried to use the quadratic equation. I had a negative number under my square root. I am wondering if this is the right approach. I used the same formula for Sue only, and found that it would take 6.63s to move the 155m with her velocity and acceleration. I've been at this for a long time and have tried many different ways. I do have a list of equations for when acceleration is constant. A little bit of guidance here would help a lot, I have spent hours now and an outside perspective would be refreshing.