[填空题]
A cyclist accelerates fras 2n0din//op+- n1x.mqhg ,ex u lz9hom rest c5x51a90z4 t avwhief at a rate of 1 m/$s^2$ How fast will a point on the rim of the tire at the top be moving after 3.0 s? [Hint: At any moment, the lowest point on the tire is in contact with the ground and is at rest — see Fig. 8–51.] $m/s$