[填空题]
A rotating merry-go-round makes on;pvpn6 lcb)2 wndnc cb3w3( d0e complete revolimmvn5oy:ge+8b5 /l j ution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a childbmv 5g 5/njl+8:iyome seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center