[填空题]
A fugitive tries to hop on a freight train traveling at a constant sp ut:gw;5jo um:mb ;t6beed of vm:z/efq-b96pxcor dk .ka8+$6.0 \; m/s$. Just as an empty box car passes him, the fugitive starts from rest and accelerates at $a=4.0 \; m/s^2$ to his maximum speed of $8.0 \; m/s$. (a) How long does it take him to catch up to the empty box car? $s$ (b) What is the distance traveled to reach the box car? $m$
