Niu Zihao at the door was very surprised, he should have heard this voice like a physics teacher, but how did he know his name?

Niu Zihao didn't think much about it, pushed open the door and walked in.

"You are Niu Zihao, the classmate who scored 13 points in the physics exam every month?" Teacher Yang opened his mouth and asked.

"I didn't expect to score 13 points, I thought I would score single-digit miles this time." Niu Zihao did not have the slightest sense of pride, but looked a little modest.

Pulling out one of the many test papers, Mr. Yang brought it to Niu Zihao, "Look at the score you tested, I think you are inflated, and even the simplest unit of acceleration can be written incorrectly, m/s is that the unit of acceleration?" ”

Question 13, you write the unit of acceleration as m/s, and then in question 17, the acceleration is written as m/s2, you have two units, and the small 2 in front of you was eaten by you?

Niu Zihao lowered his head and was silent. Let the physics teacher nag, in Niu Zihao's opinion, just the left ear in and the right ear out.

"It's not angry, it's not good for the heart." Teacher Yang stroked his heartbeat and gradually calmed down. Originally, Zhao Liyang's problem-solving process just now gave him new hope for this class, but he didn't expect to be disturbed by Niu Zihao like this, and the sea became a mulberry field! All the good memories are gone. It's also nine years of compulsory education, why are you so good.

"You, make this question on the blackboard, and I'll act as if nothing happened just now." Teacher Yang said in a calm tone: "If you can't do it, hum, along with the fact that you are late today, tell your homeroom teacher and let him clean you up." ”

As he spoke, Mr. Yang erased the answer that Zhao Liyang had just written, leaving only the question. The problem is the same as the question just now, but the difference is that it is done by a different person.

The students below were very curious about whether Niu Zihao could solve it. With such a simple test paper, I only scored 13 points, and I guess I can't do it even if I hang it on the blackboard. Hehe, there's a good show to watch now. Among the classmates below, there are many who have watched Niu Zihao make a fool of himself. Of course, there are also students who don't listen to what is going on outside the window and only read the books of the sages. Seeing that classmate reading so seriously, it is no different from the ancient well-read Confucian sages, but what he reads is not a physics book, but a novel, a martial arts novel that bravely ventures into the rivers and lakes and acts chivalrous.

Reading the novel in physics class, this classmate's perseverance has to be admired, if it weren't for the physics teacher who only cared about seizing the time to lecture, he would have thrown his martial arts novels out of the clouds.

Niu Zihao looked at the topic on the blackboard, his face was confused, and he told who to tell the bitterness in his heart. I just got up and rushed to campus, didn't let me sit back in my seat, and asked me to do the questions, I haven't read it early!

Looking at the physics problem, Niu Zihao pretended to be thinking, but in fact he was delaying time. At this time, it is a second to be able to delay. If I had known this, I wouldn't have come to class, and I slept until noon, and the first period in the afternoon was physical education, so what's wrong. To be honest, Niu Zihao still doesn't know whether the unit of acceleration is m/s or m/s2.

If you follow what you learned in junior high school, the unit of acceleration is undoubtedly m/s2. Because of the formula m/s2, he had never seen it before. However, the definition of velocity in high school physics has been further sublimated and expanded, and the concept of vectors has been added. The devil knows which is the unit of velocity and which is the unit of acceleration.

"Huh?" Niu Zihao glanced at the blackboard and scratched his head.

Teacher Yang next to him saw all this in his eyes and remembered it in his heart, is he going to start solving the problem, or is he just trying to scratch his head?

I saw Niu Zihao write in chalk:

△x=

Although it is only half a formula, in the eyes of Mr. Yang, it is indeed not easy. Students who score 13 points in a month can know this formula, and they really have great potential for development! With 13 points this time, will it be Niu Zihao's stage fright in the exam, or is there another reason. This score is indeed pitifully low, and the second-to-last students in the class in physics are more than thirty points higher than him.

Watching Niu Zihao write down the formula, Mr. Yang smiled.

What people never expected was that Niu Zihao did not continue to write.

"Is he stuck?" A classmate asked.

There was a lot of discussion among my classmates, but I didn't move. This is the principle that Niu Zihao has been adhering to for more than ten years.

Mr. Yang didn't wipe the blackboard just now, leaving a vague mark of △x=, which is equal to what is behind the sign, but he can't see clearly.

What exactly can △x equal, Niu Zihao began to rack his brains and think. This formula appeared in textbooks, but she ignored it. It's not that I ignored it, but I didn't look at it at all.

During physics class, Niu Zihao was sleeping. Even in the last week's experimental class, Niu Zihao almost fell asleep in the laboratory. If it hadn't been for the aunt who locked the door to remind him, it is estimated that he would have spent the night with those experimental instruments.

The more I think about it, the more I can't think of it.

Watching Niu Zihao pick up the chalk again and prepare to start writing, the hearts of all the students in the class were raised to their throats.

△x=aT2。

A beautiful girl's voice rang out, causing the whole classroom to fall silent immediately.

The students were stunned, everyone's first impression. This voice came from Niu Zihao, when will he change his voice and become like a girl.

Zhao Liyang really couldn't bear to see Niu Zihao hanging on the blackboard and making a fool of himself, and as a tablemate, she was also obliged to tell him the correct answer.

Niu Zihao heard it clearly this time, "the square of the kicked", translated into English is "IT2", why is this formula a little awkward. Even Niu Zihao himself would not believe it, how could there be a symbol of current I in the formula of acceleration, could it be that the car accelerated uniformly, and then generated an electric current.

Teacher Yang really couldn't bear to look directly at the answer written by Niu Zihao, so he raised his leg and kicked Niu Zihao's buttocks. "Go down, don't be ashamed, your table mates have told you the answer, and you can still write wrong. I really don't know how you wrote this △x, so I will do the test paper of this monthly exam again, write the analysis under each question, and hand over the extracurricular activities to my office in the afternoon. ”

"Alas!"

Teacher Yang looked up to the sky and sighed, it is really a big forest, and there are all kinds of birds.

"Okay, students, let's take a look at this question ...... next."

Looking at Teacher Yang's relishing lecture style, Niu Zihao glanced at Zhao Liyang next to him and wanted to say something, but as soon as he opened his mouth, he swallowed the words again. Seeing Zhao Liyang taking notes seriously, Niu Zihao looked at her with a little more admiration in his eyes, that feeling was more like a favor he owed her today, and if he had time in the future, he would definitely pay it back. Although Niu Zihao didn't say thank you to Zhao Liyang on his lips, he had already said it in his heart.