1. use newton's first law of motion to explain how wearing a seat belt in a moving car could prevent injury
2. a skydiver prepares to jump out of a plane. explain how gravity and air resistance will affect the motion of the sky diver before and after he or she opens the parachute
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Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?
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