My truck was rear ended. It has a steel and chrome bumper, the vehicle that hit it has a soft bumper, and was travelling at 15 miles per hour. My bumper showed deformation by being bent in 1.27 cm and bent up 1.5 cm. The truck which was with the brakes on, also moved forward 6 inches. The soft bumpered bullet vehicle, showed the same amount of crunch ; I am assuming.... My question is what is the actual Crunch that I can input into the Acceleration, Velocity , Crunch formula???? In centimeters or inches.??