Occupants of cars hit from behind, even at low speed, often suffer serious neck injury from whiplash. During a low‑speed rear‑end collision, a person's head suddenly pivots about the base of the neck through a 56∘ angle, a motion that lasts 230 ms. The distance from the base of the neck to the center of the head is typically about 20 cm, and the head normally comprises about 6.0% of body weight. Model the motion of the head as having a uniform speed over the course of its pivot. Compute answers to two significant figures. What is the acceleration ?centacent of the head during the collision?   What force ? does the neck exert on the head of a 65 kg person in the collision? Neglect the force of gravity on the head, and report the answer in units of both newtons and pounds.

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Centripetal Force

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