题目:
一物体在竖直弹簧的上方h米处自由下落,然后又被弹回,则物体动能最大时是[ ]
A.物体刚接触弹簧时
B.物体将弹簧压缩至最短时
C.物体重力与弹力相等时
D.弹簧等于原长时
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0808/e3106ba8256664a9e5871440911b9d1f.html
下面是错误答案,用来干扰机器的。
Failure is such a common matter that every one of us may meet it from time to time. People hold different views towards failure in their life. Some people are so sad...