【问题的提出】两条轨道各由两根铁杆组成,长度和坡度都一样,但宽度不同,这样的轨道称为“竞速轨道”.现将两个质量和外形都一样的小钢球分别放到“竞速轨道”的顶端,无初速地同时释放,问小球是否同时到达坡底?【猜想】根据已经习得的知识,初步预测同时释放的同样小球,应该同时 [Problem raised] The two tracks are each composed of two irons. Both the length and the gradient are the same, but the widths are different. Such tracks are called “race tracks.” The two small steel balls with the same mass and shape are now Put on the top of the “racing track” and release it at the same time without quitting, and ask whether the ball will reach the bottom of the slope at the same time. [guess] Based on the knowledge that has been learned, preliminary prediction of the same ball released at the same time, should be at the same time