[填空题]
A hollow cylinder (hoop) ir mzz d-67je l2gt,4nfs rolling on a horizontal surface at speed;t 7,*fymym 4 p, jff+cqcnrt( v=3.3 $m/s$ when it reaches a 15 $^{\circ} $ incline.
(a) How far up the incline will it go? $\approx$ m (round to one decimal place)
(b) How long will it be on the incline before it arrives back at the bottom? s
