[填空题]
A rotating merry-go-roun7 64mp6wdy:hi(g 2ut,a 2f kgoco3impmoipt2l x dbi9o. nh3hf85ww*e 0a3 g9d makes one complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m from the cenighn aho ibo5x3l89* 32m wd.e f09tpwter? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center