[填空题]
A person has a reasonable chance ofgu* i;bvjnnt -naf93- surviving an automobile crash if the decqu3)y/qf v.bqeleration is nqyu.f ) bq/3qvo 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 $\mathrm{~km} / \mathrm{h}$ ?
