[填空题]
A rotating merry-go-rout 9-aenlgk2w 7nd makes one complete revo q4tnj xgcr 0y-b8n50hlution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m fr0b-xt8rn45yh cg0nq j om the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center