A pick-up truck struck a 200-lb pedestrian in the center, full impact, propelling the body forward. The pedestrian’s body came to rest 120 feet from the point of impact. The center of mass of the upright pedestrian at the time of impact was estimated to be 3.5 feet above the pavement, the drag factor of the body on the concrete pavement was estimated to be 0.60, and the braking friction of the truck on the dry level surface was 0.70.

If the truck left 40 feet of skid marks prior to striking the pedestrian (with full braking), how fast was the truck initially traveling?