[填空题]
A world-class sprintmj4o 0d5z w+ ;)zel 6axr(6w/vgfagp9xr t6z eer caya 44pmg4s b d,ujm3zs4i2 xq5n burst out of the blocks to essentially top speed abou5d4jusazm4 4 i,bqgym2xp4 3st $13.0 \; m/s$ in the first 18.0 m of the race. What is the average acceleration of this sprinter? $m/s^2$ and how long does it take her to reach that speed? $s$
