a car's bumper is designed to withstand a 12.7 mph (5.68-m/s) collision with an immovable object without damage to the body of the car. the bumper cushions the shock by absorbing the force over a distance. calculate the magnitude of the average force on a bumper that collapses 0.237 m while bringing a 925 kg car to rest from an initial speed of 5.68 m/s.