[I must thank the real estate tycoon of the same group of gods, the sister is pregnant and bedridden, and it is not in vain to give a reward to the fat man, I am so moved, I wish the girl good health, smooth childbirth, and a happy pregnancy. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ】

……

Liu Chen shouted, "What is the speed?"

"I ...... I ......" Zheng Yuan seemed to calculate reflexively, but he couldn't calculate it.

The two soldier brothers hugged him, no matter how hard he struggled, it was useless, everyone finally breathed a sigh of relief, and the two sides dragged Zheng Yuan down, and the principal Sun Shuren also breathed a sigh of relief, and said: "The two comrades have worked hard, and this classmate has also worked hard, what is your name, which class? Thanks to your quick wit." ”

Gu Witch said, "Principal Sun, this is Liu Chen's classmate in our class. ”

"Good, good, good. Sun Shuren said three good things in a row, obviously very sure of Liu Chen, but he was not impressed by this classmate, and it seemed that his grades were not very good.

"Let's all go down quickly," he said to the workers next to him, "Lock this entrance so that no one can come up again." ”

After everyone came down, Zheng Yuan's mother and sister also came, and after seeing him, they pounced together, hugged their heads and cried, "Son, why are you so stupid, if you can't get into college, we won't take the exam, how can you not think about it, if you don't have it, how can your mother live......"

"Mom, I'm useless, I can't learn well......" Zheng Yuan cried bitterly.

Liu Chen was also very moved when he saw it, it was true that he had put in his best efforts, but the method was wrong, just like in physics, the moment is the multiplication of the force and the effective distance, no matter how large the force is, the effective distance is almost negligible, and it has little effect.

It's just such a simple truth, which can only be understood after countless times of hitting the head and bleeding, and some people have never been able to apply it in practice.

The head teacher of class 7 stood aside embarrassedly, he reprimanded Zheng Yuan a few words, but he didn't expect this student to be unable to think about it, he was so frightened that he was terrified, and after calling the police, he hurriedly went to find his mother and sister to come over, and finally saved it, and breathed a sigh of relief.

Those classmates who were pulling the four corners of the quilt were still working hard, Liu Chen walked up and said with a smile: "Everyone let go, everyone has been saved, what are you still pulling, hard work." ”

Although everyone worked hard, they were very happy, and when everyone else was a spectator, they did their best, and there was a sense of honor and pride.

When Sun Shuren saw this battle, he asked with a smile: "Little classmate, what kind of reputation are you like this?"

"I'm a buffer set according to the momentum theorem!"

"Oh, how do you calculate?" Sun Shuren is a physics teacher.

"Heh, I just made a rough calculation, the top of the sphere is about 20 meters high, counting the air resistance, the air resistance coefficient is 1, the air resistance is proportional to the square of the speed, the landing speed should not exceed 16m/s, Zheng Yuan's weight is about 45kg, and the momentum change is no more than 720 ......"

The students all listened with their ears pricked up, and they only thought it was so interesting, they were all confused for a while just now, Liu Chen was actually calculating this, although many people know the formulas in physics, but they can't do it quickly in reality, and they can't do it at all.

Zheng Yuanyuan, who was crying bitterly, listened to Liu Chen's analysis curiously.

"The impulse is determined, the next step is to increase the contact time of the collision as much as possible, the flowers and trees and the quilt covered on it can play a certain buffer, the buffer time is still too short, and then use the quilt to tie the corner of the quilt, set up two layers of buffers at about 1.5 meters and 1.2 meters, I believe that the collision time must be more than 0.5 seconds, then the impact force is less than 1440 Newtons, within a safe range. ”

Liu Chen was also in a relaxed mood and said what he thought.

Amazed!

It was calculated so thoroughly in such a short period of time!

Sun Shuren has been teaching for many years, and he has never seen such a talented and agile student, and his love for talent is great, but it's a pity that there are still two months to take the college entrance examination.

The eldest brother of the soldier who saved people just now gave a thumbs up and praised: "I used to hear the old people say, learn mathematics, physics and chemistry, and don't be afraid to go all over the world, little brother, you have opened my eyes today, I said how to make a layer of quilt on the ground, it turns out that there is still this great use." ”

Zheng Yuan sighed in his heart after hearing this, it seems that he really didn't learn this material, hey, just go out to work early, and his mother and sister can also relax.

Gu Witch looked at Liu Chen strangely, why didn't she find out that there was such a student in the class before, this guy has been a little weird recently, he doesn't look like a high school kid at all, hum, he murdered me just now!

Women are vengeful creatures.

Sun Shuren said with a smile: "Liu Chen's analysis is wonderful, but I think you are bad!"

"Huh?" Liu Chen's mouth grew.

"You made so many female classmates' quilts like this, and you damaged some flowers and trees, what do you say you should do?"

This is to settle accounts after the autumn, Liu Chen defended: "Principal Sun, I am bent on saving people, and I don't think about anything, but I can't cross the river and tear down the bridge like this." ”

"Hahaha, I'm kidding you, see if you're in a hurry, don't worry, these flowers and trees, I'll help you deal with the aftermath, and I won't let a girl trouble you, okay?" Sun Shuren laughed.

At such an age, he still likes to joke, Liu Chen exhaled, "That's a good dare." ”

The classmates scattered in all directions, and Gu Witch directly grabbed Liu Chen, and no one around dared to approach.

"You actually murdered me!"

"I'm sorry, Mr. Gu, the situation was urgent, and you also saw it, I had no choice but to do it, ha, I couldn't help myself. ”

"Hmph, for the sake of your meritorious efforts in saving people, I won't bother with you this time, and let me honestly go back to the classroom to study hard. ”

"Teacher Gu, you are so strict with me, aren't you afraid that I won't be able to jump off the building?"

Gu Witch directly pinched his arm and scolded: "Phew, crow's mouth, you are so thick-skinned, you won't be unable to think about it, and then call your parents with a flamboyant tongue." ”

"It hurts, it hurts, it hurts, Teacher Gu, you're corporal punishment of students!"

"It's also corporal punishment, just your rough skin and thick flesh, it hurts a fart. Gu Witch was so angry that she burst into foul language.

"Teacher Gu, it's so unfair, why can Qian Shuai, Meng Qingqing, and Yang Xue say that they won't come if they don't come, I have to stay in the classroom honestly all day long. ”

Gu Witch glanced at her and snorted, "If you can enter the top 30 of your grade, you can too." ”

"Teacher, isn't it a mock exam next week, if I do well in the exam, can I be relatively free and not have to sit in the classroom all the time?" Liu Chen tentatively.

"You give me honesty, don't be ambitious, if you work harder, you can go to a key university, do you know how big the gap is between one book and two books? I tell you that it is much bigger than you think, if it is 211 again, then the advantage will be more obvious in the future. ”

"Isn't 985 better?"

"Phew, don't think about 985!" Gu Yuan said angrily, I still want to read 985, boy, my heart is quite big.

Liu Chen stopped talking.

In fact, I was speechless.

When he arrived at the door of the office, Gu Yuan grabbed Liu Chen, Liu Chen was very frightened, teacher, what are you going to do? Don't be so rude!