[填空题]
A rotating merry-go-rou/ v. q1psx,clgnd makes one complete revolution in vq-z4j:aon-:4f0gta5 s tr ue4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m from t45-o:qvgztjt 4 sa:ea-f0u rnhe center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center