[填空题]
A hollow cylinder (hoop) is rolling l djtonl7.84(b+ik ce on a horiie1tl5o4 1isebd u)b siub -),pd+n)lzontal 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