car-wall collision problem (urgent) 1. The problem statement, all variables and given/known data What net force is acted upon the car by the wall during the collision. Explain your answer along with what assumptions you made. 2. Relevant equations 3. The attempt at a solution http://www.youtube.com/watch?feature=player_embedded&v=ywJ3WGpf0hw This video is the example of the question. So im not sure what the question mean by the net force acted upon the car.