[填空题]
(a) A yo-yo is made of two solid cylindrical disks, each of mass 0.050xms2 uf+ fx5itow10j4 kg a.ilsy)b; e :pm4tfvey;.tvmzye w.80nd diameter 0.075 m, joined by a (ce.t.lv :ifz8e be;; yw.pm) svym0y 4toncentric) thin solid cylindrical hub of mass 0.0050 kg and diameter 0.010 m. Use conservation of energy to calculate the linear speed of the yo-yo when it reaches the end of its 1.0-m-long string, if it is released from rest. $m/s$
(b) What fraction of its kinetic energy is rotational? %