[填空题]
A rotating merry-go-round makes ona4nif7ybtr01 2bh(e g e complete revolution in 4.hh:vr+flw m 3vlfmjih7. s7 210 s (Fig. 8–38). (a) What is the linear speed of a child seateh.2:vr ls1h3ifhmmv lj +f7w7d 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center