Which example identifies a change in motion that produces acceleration? choices are: 1. a speed skater moving at a constant speed on a straight track 2. a ball moving at a constant speed around a circular track 3. a particle moving in a vacuum at constant velocity 4. a vehicle moving down the street at a steady speed user: how did the great depression eventually change germany politically? choices are: 1. germans eventually believed that democracy would solve their economic problems. 2.