[填空题]
A hollow cylinder (h yn:srn6da..lj2sk9m-ne 4j2wr ns;d oop) is rolling on a horizontal surface h,zru9 y q.er)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