[填空题]
A rotating merry-go-round makes ,fa4i4x/4n58 j igkj;no blqrone complete revolution in 4.0 s (Fig. 8–38). km:u-. s cj(xov,vuh-jkg d5*(a) What is the linear speed of a child seated 1 d-s,u:gkjju vhmvk*-c5o. x(.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center