A set of crash tests consists of running a test van moving at a speed of 10.8 m/s (23.76 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 55 kilogram (121 lbs) dummy is found to move a distance of 0.63 meter from the moment the cartouches the wall to the time the van is stopped. Find the size of the average force which acts on the dummy during that time?