[填空题]
A rotating merry-go-roundj )36mp wn;0fk hhp5bb makes one compls;yq,4oay-k- gu 6nlhete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 y nh,kyug 4ls-q-6a;om from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center