[填空题]
A rotating merry-go-roundn9 )i- 3 m3w c6zfxpno-ypnn,l makes one complete revolution in 4.0 s (Fig5 eiugg*194c ,hed eew. 8–38). (a) What is the linear speed of a child seatwi*e49,h gcg de5u ee1ed 1.2 m from the center? $m/s$
(b) What is her acceleration (give components)? $m/s^2$ the center