Problem: A set of crash tests consists of running a test car moving at a speed of 12.6 m/s (27.7 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 55.0 kg (121.0 lbs) dummy is found to move a distance of 0.660 m from the moment the car touches the wall to the time the car is stopped.
Part A: Calculate the size of the average force which acts on the dummy during that time.
I need help to calculate the size of the average force which acts on the dummy.