1. The problem statement, all variables and given/known data a vehicle starts from rest and accelerates at a reate of 2.0m/s2 in a straight line til it reaches a speed of 20m/s. then it slows to constant 1.0m/s2 til it stops. how much time elapses from start to stop? how far does the vehicle go? 2. Relevant equations I have: a1 = 2.0m/s2 a2 = 1.0m/s2 v1 = 2.0m/2 v2 = 0.0m/2 3. The attempt at a solution what I did was this: t1=0s then 2m/s2 * 0s= 0 t1=1s then 2m/s2 * 1s = 2m/s t1=10s then 2m/s2 * 10s = 20m/s that gives me 10 seconds later the vehicle gets to a = 20m/s so now the same thing for slowing down setting my 20m/s to t=0 and working from there t2=0 then 1m/s2 * 0s = 0 t2=1 then 1m/s2 * 1s = 1m/s t2=20 then 1m/s2 * 20s = 20m/s now I have: total time: t2 + t1 = 20s + 10s = 30s this is the only equation given that I know how to apply: total distance: based on a = d/t set to solve for d so d = at total distance: d1 = 2.0m/s * 10s = 20m d2 = 1.0m/s * 20s = 20m 20m + 20m = 40m total time travelled is 30s total distance travelled is 40m the problem is I did not use any of the basic equations I was given in my book for this. I am at a loss as to how to match my equations to my work...... and seeing as this is the first week of the semester I have a feeling this is going to come back to haunt me drastically in about 4 weeks. thanks for any advice offered.