[填空题]
A rotating merry-go-round makes one completopqy6ip 3*ahdr4n59yud*j/p x;gu ;qe revolution in 4.0 s (Fquw sb:tz9pp8 u.v hczfx:u8-:-ac.f.x l cj1ig. 8–38). (a) What is the linear speed of a child uqsu. jcc:atz8fxx h1c9 -zb-pv .w::8.lupfseated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center