I've been trying to study for my final and I can't seem to figure out how is this suppose to work. 1. The problem statement, all variables and given/known data A wall (m infinite, v=0) hits a car (m=2600 kg; v=142 km/h). The car becomes deformed and the crush zone (0.7 m) is compressed. Calculate the corresponding acceleration (assuming a constant value). Within which time interval does that compression happen? Try to find out, how fast each part of the airbag system therefore has to operate. Imagine the crush-zone is replaced by a spring. Calculate the required spring constant. 2. Relevant equations 3. The attempt at a solution I think it has to do with newtons second law but I dont know what to do with that velocity.