[填空题]
A cyclist accelerates from rest a(o63 p jhjcyv)t a 6sw.s4l j,s7pfn zzt*rate of 1 m/ 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.]