[问答题]
Two solid spheres sim*)trcwb tp7 *bultxkt i;is). pd5aneously start rolling (from rest) down an incline. One sphere has twice the radius and twice the mass of the other. Which reaches the bottom of the incline first? Which has the greater x5 s;)pdtk.iispeed there? Which has the greater total kinetic energy at the bottom?