[填空题]
A fugitive tries to hop on a freight trainjh(r1fvur 8.l*/ bhp l travel -h k-.7 9ynrwabq 4j5hnhv+qling at a constant speed of $6.0 \; m/s$. 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? $m$
