how does inertia affect a person who is not wearing a seatbelt during a collision?
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A car leaves the road traveling at 95lm/h and hits a tree coming to a complete stop in 0.16s. What force does a seatbelt exert on a 55 kg passenger during this collision?
A 60 {\rm kg} person is in a head-on collision. The car's speed at impact is 15 {\rm m/s} . Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
A farsighted person uses glasses with a refractive power of 3.6 diopters. The glasses are worn 2.5 cm from his eyes. What is this person's near point when not wearing glasses?