Why does a properly adjusted head restraint prevent head and neck injures to occupants in rear-end collisions?

A properly adjusted head restraint works to reduce the force from whiplash. Based on Newton's first law of motion, your body will continue to move even when your car isn't moving, and the head restraint reduces the force of impact

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Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.