This past weekend - Sunday, July 26th to be precise - Ferrari Formula 1 driver Felipe Massa suffered a HORRIBLE head / eye injury in the Grand Prix of Hungary as a result of an object striking his helmet and visor after having been "thrown" (disconnected) from another racing car ahead - an 800 g coil suspension spring. He was traveling (according to telemetry) approximately 170 mph at the moment of impact. What was the net force of impact upon him - in "American" units? Is it a simple f = m x a equation? If so, 800 g = 1.764 pounds of "mass" and his speed (acceleration or velocity) - 170 mph - equals almost 250 feet / second. Where do I drop out the "second" and call this about 440 pounds / feet of energy striking him? Or is there a more correct formula? (Trying to convince those in a non-technical office environment as to the laws of physics acting upon us ...) Thank you.