[填空题]
A rotating merry-go-round makes one complete revoluta+ 7hkobz0p zaww+z/7ion xp3t3* hxq yg:in 4.0 s (Fig. 8–38). (a) What is the 3hxgpytx:3q *linear speed of a child seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center