[填空题]
A rotating merry-go-ro l-vcm)uu0pk ;un cm1j(-38lqdhaej b0fd makes one complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a m1(hej-30qc jba 8f ldchild seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center