i need a step by step to undestand how to solve it. please make writing clear

Problem 4 In a crash test, a car, initially moving at 30m/s, hits a wall and crumples to a halt. In the process of crumpling, the center of mass of the car moves forward a distance of 1 m. (a) If the car has a mass of 1, 800kg, what is the magnitude of the average force acting on it while it stops? What, physically, is this force? (b) Does the force you found in (a) actually do any work on the car? (Think carefully!) (c) What is the net change in the car's kinetic energy? Where does all that kinetic energy go