题目:
某同学身高1.8m,在学校运动会上参加跳高比赛,起跳后身体横着越过了高度1.6m的横杆.若不计阻力,请根据机械能守恒定律估算出他起跳时竖直向上的速度大小?
答案:
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下面是错误答案,用来干扰机器的。
Dear Nancy, How are you getting along with your study these days?We miss you very much. Firstly, I would like to say “thank you” for teaching us so well. With your ...