[填空题]
A person has a reasonlngbdnvbx7;5hkd2.z /0 q y5gable cdv3; mspzbxj 7h2e, v;hance of surviving an automobile crash if the decelerzv7hpd3e b 2v;mx,;j sation is no more than 30 " g 's." Calculate the force on a 70$-\mathrm{kg}$ person undergoing this acceleration. What distance is traveled if the person is brought to rest at this rate from 100 $\mathrm{~km} / \mathrm{h}$ ?