[填空题]
A rotating merry-go-round makes one complete revolution in 4.0 st 9+j zqvl2 xoqf f te(-8e2m7r0xnlz: (Fighf1.p+y:jw +dm;w3j ueobr db 855.z mbx ed9j. 8–38). (a) What is the linear speed of a child seded951r. dj 3bu.obb+fj;e x8hmzjw5+:p wy m ated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center