[填空题]
A rotating merry-go-round makes one coml9hflw6 h3o37g)cufs;r ,dsbg/8kak plete revoludc mutp8.5c3cf 8fu+ntion in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m from the cep5u.8+cf n 3dtmfc 8ucnter? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center