In the design of a spring bumper for a 3670-lb car, it is desired to bring the car to a stop from a speed of 8.2 mi/hr in a distance equal to 10 in. of spring deformation. Specify the required stiffness k for each of the two springs behind the bumper. The springs are undeformed at the start of impact. Answer: ki 8.2 mi/hr lb/in.

In the design of a spring bumper for a 3670-lb car, it is desired to bring the car to a stop from a speed of 8.2 mi/hr in a distance equal to 10 in. of spring deformation. Specify the required stiffness k for each of the two springs behind the bumper. The springs are undeformed at the start of impact. Answer: ki 8.2 mi/hr lb/in.