[填空题]
A rotating merry-go-round makes one complete revolution in 4.0 s (Fig.j5/z5pt5cr0f 4 zsfdd -b8 qpct3hn+c8vecld9 r6 sf+8–38). (a) What is the linear speed of c8 bchtdqls9+fp e+nv-8rc63a child seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center