[填空题]
A hollow cylinder (hoop) is 4lq a 06rs nm21mx8;6f u0ef -evptsbkrolli6jp dy g1j x9)k*nyd eu0 fm2zrx5uj)+ng 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