[填空题]
A rotating merry-go-round makes one c n8rfggj - wu0ea2328 ea:hzebomplete revolution in 4.0 s (Fig. ;wl0jp/n,um 4fpi x:c8–38). (a) What is the linear speed of a child seated nwxu/;:lfj p04imp,c1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center