1. The problem statement, all variables and given/known data Speedy Sue, driving at 33.0 m/s, enters a one-lane tunnel. She then observes a slow-moving van 165 m ahead traveling with velocity 5.20 m/s. Sue applies her brakes but can accelerate only at -2.00 m/s2 because the road is wet. Will there be a collision? If yes, determine how far into the tunnel and at what time the collision occurs. If no, determine the distance of closest approach between Sue's car and the van and enter zero for the time. 2. Relevant equations Vx - Current velocity V0 - Initial velocity a - acceleration x - Final Position x0 - Initial displacement vx^2 = v0+2a(x-x0) 3. The attempt at a solution By doing a graph I estimated a crash at about 6-7 seconds but that is as far as I got... I am completely stumpted on this "two particles" deal... I tried the above formula and somehow ended up with a 0 on the bottom because the van does not accelerate... Any help / answer / example would be very much appreciated. Thank you.