[填空题]
A rotating merry-go-round makes one complete revolution in 4.0 s (Fig. 8–38)d4xx14bxu3 va8 kqgi( . rhp c8s;k4jy*5 r- ff :(unaxp(a) What is the linear speed of a child seated 1.ff ;*s8up:pcjyk5 4(hr rxan-2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center