[填空题]
A hollow cylinder (hohf fe 7rsr(8vz ih,1f4op17 rekkc *n4n9p st2mu) is rolling on a horizontal surface at speed 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