You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 41. 0 mph. The cars locked bumpers and slid eastward with their wheels locked for 21. 5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0. 750.
How fast (in miles per hour) was car A traveling just before the collision?