UC知道两个英文物理题
来源：百度知道 编辑：UC知道 时间：2024/06/06 17:30:53
1. An elevator under repair is descending at constant speed. At the moment it passes the mechanic, he drops his wrench. The wrench hits the elevator after 1,4second. What is the speed of the elevator?What is the speed of the wrench at the moment of hitting?
2. For a freely falling body, what is the ratio of the time needed to cover the first half of the distance and the time needed to cover the second half of the distance?
2. For a freely falling body, what is the ratio of the time needed to cover the first half of the distance and the time needed to cover the second half of the distance?
第一道题不是很明白是什么情景
觉得缺条件
第二道问的是自由下落的物体在前半路程和后半路程所用的时间比是多少
画图比较直观
答案应该是1/(√2 - 1)