Two identical balls roll off the edge of a horizontal table top.One leaves traveling at twice the

题目

Two identical balls roll off the edge of a horizontal table top.One leaves traveling at twice the
Two identical balls roll off the edge of a horizontal table top.One leaves traveling at twice the speed of the other.Which ball hits the floor first?Why?

答案

Actually,the two balls hit the ground at the same time("t ",mentioned in the following).
Reason:According to the formular~h=1/2at*at With the same height~"h",It is determined only by acceleration due to gravity(重力加速度)~"a"(mentioned in the formular)
中文版,答案为：二者落地时间相同
原因,根据物理公式：h=1/2at*at ,其中,h代表高度,a代表重力加速度,t代表落地所需时间.由于两个球从同一高度落下,重力加速度相同,所以,由公式可知,落地时间也相同