114/6/17

Today I was making a great progress in law of conservation of mechanical energy in the library. I did some exercises and finally understood questions I didn't before, espacialy questions related to springs, just use a sole equation and it can be sufficient for most of questions :1/2kR^2=1/2kx^2+1/2mv^2.

Today, I made great progress on the law of conservation of mechanical energy in the library.
I did some exercises and finally understood the questions I didn’t understand before, especially the ones related to springs.
You can simply use one equation, which is sufficient for most of these questions:
½kR² = ½kx² + ½mv².

中文翻譯：

今天我在圖書館裡對「機械能守恆定律」有了很大的進步。
我做了一些練習題，終於弄懂了之前不會的題目，特別是和彈簧有關的題目。
其實只要用一個公式就可以解決大多數這類問題：
½kR² = ½kx² + ½mv²。