6. Following are an application of law of inertia EXCEPT. a. Headrests are placed in cars to prevent whiplash injuries during rear-end collisions. b. Passengers tend to move backward when the vehicle suddenly stops. c. The head of a hammer can be tightened onto the wooden handle by banging the bottom of the handle against a hard surface. d. Blood rushes from your head to your feet while quickly stopping when riding on a descending elevator​