[填空题]
(a) A yo-yo is made of two s ;v l.5vs /g7g9k bbfwpwsy x)i3.wda9olid c+bj wpbp92j g :(;zon4bo 0rxgylindrical disks, each of mass 0.050 kg and diameter 0.075 m, joined by a (concentric) thin solid cylindrical hub of mass 0.0050 kg and diameterbnzbr pp(jgjgb0+x 9;2oo 4:w 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? %
