[填空题]
A world-class sprinter can burs / tivom88 2*d(asle8hvwcd w3ywz7 g8t out of the blocks to essen e9bh4-uklxj l)d( /xwtially top speed (of about 11.5 m/s) in the first 15.0 m of the race. What is the average acceleration of this sprinter, a)x-4jblu(l/xdh 9w k end how long does it take her to reach that speed? $\approx$ = $m/s^2$ (retain two decimal places) s
