>> and they also discovered that steve and deborah had been in the cabin before the car crash. several items they had purchased that night were in the cabin. so snyder decided to take a closer look at the hollermanns' jeep, as well as the accident scene. steve said he was driving 60 miles an hour when the accident occurred. accident reconstruction experts have a way of confirming this. if a parked car is hit, the distance it moves after impact can tell you the speed at which it was hit. it's based on sir isaac newton's laws of physics, specifically conservation of momentum. when one object strikes another, as in this demonstration, its momentum is transferred to the other. all things being equal, the speed of the first ball is equal to that of the last.