[填空题]
A rotating merry-go-round makes one complete revolutio2,dp0j yumx,-ejb/ p.tl nr- sn in 4.0 s (Fxp qcqsx / m bdkiw9yw9+1as7)* 1tqu6ig. 8–38). (a) What is the lik 1p)bq y/uxia7* wq6ssw dtc 9m+91xqnear speed of a child seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center