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一、单选题 1.一个质量为20克的物体在高楼的楼顶上从静止开始下落,经5秒落到地面,接触地面前的动能为16焦耳,则高楼的高度是 答:[ ]
First, multiple choice questions 1. An object with a mass of 20 grams falls from a standstill on the roof of a high-rise building and falls to the ground within 5 seconds. The kinetic energy before touching the ground is 16 joules. The height of the tall building is A:[ ]