1. The problem statement, all variables and given/known data Calculate the acceleration of the train during the trip down the first hill Time for train to go from top of hill to bottom:3.5 s Time for train to pass point at top of hill 1.5s Time for train to go from bottom to top of first hill:7 s Time for train to pass point of bottom of hill:1s Height of hill: 16.155 m 2. Relevant equations d=V(initial)(t)+.5(a)(t)^2 3. The attempt at a solution I tried using that equation but there is two variables missing distance and acceleration. I can't use the height of the hill because isn't this a x problem (parallel problem)? I don't understand how I can find the acceleration of the rollercoaster train during the trip down the hill with only this data.