Chapter 56 Is She a Good Person?

Assume that the centers of mass of the truck and the heavy object are located at x and x respectively before braking; after braking, the truck has moved a distance s until it comes to a complete stop, and the two centers of mass are located at x’=x+s and x=x+s+L respectively. So there is

Δx=M+m divided into Mx’+mx’-M+m divided into Mx+mx=M+m divided into (M+m) s+ML=2ug divided into v

From this we can get:

s=2ug divided v-M+m divided mL

"Sigh... GG, I'm done with the impulse theorem. I don't have enough time to check it."

Wu Bin raised his head and sighed, rubbing his temples.

At this time, Gu Fan stretched his head over and took a look at the 40 or so lines of calculations densely packed on the draft paper on Wu Bin's desk. He took a breath and said, "Have I really studied physics?"

"Well, you have learned it, but you haven't learned this yet." Wu Bin nodded.

"Then I really hope I never learn this. What is this? A semifinal question?"

"No, it's a sad memory." Wu Bin shook his head.

"Snake spirit disease." Gu Fan rolled his eyes at him.

When Wu Bin first returned to the classroom, his classmates originally planned to throw flowers for him to celebrate, but when they saw Wu Bin's bewildered look, they decided to just watch him quietly.

After the fourth period in the afternoon, Zhang Qiu ran to Wu Bin and asked, "I'm just curious about what the questions will be like in the semi-finals. If you're not in the mood to talk, I'll get out of here immediately."

"Read it yourself." Wu Bin handed several pieces of draft paper to Zhang Qiu.

"Thanks."

After Zhang Qiu finished speaking, he took the draft paper and read it with a solemn expression.

"Well...well, well~oh~hiss..."

"You're an opera singer." Gu Fan, who couldn't stand Zhang Qiu's weird accent, complained.

Zhang Qiu ignored Gu Fan, but gently put a few scraps of paper back on Wu Bin's desk, left a few words, and turned around to leave.

"Just think that I...have never learned how to compete."

This made Gu Fan happy and said with a smile: "It turns out I'm not the only one who can't understand the co-authorship."

"Wu Bin, are you going to have dinner?" At this time, Xu Hao and Wang Qi came over and asked.

"You go ahead, I'll come over later."

Xu Hao and Wang Qi looked at each other, nodded, and asked no more questions.

"Come on, let's go, I heard there's a lion head here today." Gu Fan pushed the two of them and walked out of the classroom together.

Wu Bin, who was alone in the classroom, raised his head, closed his eyes, and fell into deep thought.

After all, this was his first time participating in a competitive game, and his desire to win was unprecedentedly high.

Compete with others for ranking, and after victory, advance to the next round for more intense fighting. Is there anything that can stimulate hormones more than this?

'Maybe next time I...'

"Hey, Wu Bin."

As soon as Wu Bin started thinking, a voice suddenly interrupted her, startling him. After all, he thought there was no one in the class.

"You're scary, really scary, classmate." Wu Bin opened his eyes and looked at Pei Jiamin in front of him and said.

Pei Jiamin smiled sheepishly after hearing this, "Sorry, I thought you heard my footsteps."

"Is something wrong?" Wu Bin asked, sitting up straight.

"Well, I just want to say that I admire you for being able to enter the semi-finals of the competition." Pei Jiamin said while looking at the classroom door with the corner of her eye, fearing that other students would return to the classroom like her.

Although even if some classmates came back, they would only see her and Wu Bin chatting from a distance, but she still felt her heart beating very fast.

"Oh...actually, there's nothing to admire."

Wu Bin was still a little confused when he heard from Pei Jiamin that she admired him. Why did this woman suddenly change her gender?

"Actually, when I was a freshman in high school, I also thought about participating in a math competition, but the school didn't pay much attention to the competition, and I couldn't balance the competition with normal studies." Pei Jiamin glanced at the door of the classroom secretly and found that it was still the same. When there was no one around, he continued, "So when my test scores dropped for the first time, my teacher and my mother came to persuade me to study hard and stop thinking about competing."

"Huh? Your grades have declined? Have you ever experienced this before?"

In Wu Bin's impression, this female top student has always been among the best in the class.

"Yes, it was during the mid-term exam of my first year of high school that I dropped from the 8th grade to the 17th grade."

"oh."

Wu Bin, who nodded and said the word "oh" expressionlessly, could only think in his heart at this moment, 'Haha! ’

Seeing Wu Bin nodding, Pei Jiamin continued: "At that time, I gave in. I gave up the competition and started to concentrate on studying. So when I heard that you entered the semi-finals of the physics competition, I felt very impressed because you did it. Things I didn't do.

Before Wu Bin could respond, Pei Jiamin suddenly took out a can of ice Coke from behind and stuffed it into Wu Bin's hand, and said, "When you have troubles, drinking something cold will make you feel better."

"Oh...thank you." Wu Bin nodded, feeling the coldness on the Coke can.

"I believe that as long as you continue to work hard like this, you will succeed."

After saying that, Pei Jiamin ran out of the classroom like flying, her whole face turned red.

"What's going on..." Wu Bin, who scratched his hair, looked confused.

'Maybe she... is a good person? ’

‘After all, she said she admired me, hahahahaha! It seems that he finally knows how powerful I am. ’

After thinking about it, Wu Bin pulled the tab of the Coke and took a few sips of it.

"Huh...it seems to feel a little better. Well, I'll give her a bottle tomorrow."

Wu Bin, who was in an improved mood, slowly walked out of the classroom with a Coke and walked towards the cafeteria.

…

On the third day, Wu Bin went to Mingguang Middle School to take the experimental test.

One of the two experimental questions is the observation of the spectrum, and the other is the measurement of the magnetic field using the Hall effect, both of which are included in the "Experimental Instructions".

As a "genius" for experimental questions, Wu Bin naturally did it easily and smoothly, making the invigilators nod secretly when they looked at it.

‘40 points should be stable. ’

After taking a deep breath, Wu Bin thought in his heart.

After returning to school, Wu Bin did not slack off in the physics competition because he might not be able to enter the provincial team. Instead, he became more obsessed with studying. He was so obsessed that Gu Fan, who wanted to ask him two questions at noon, was not very good at asking him. .

Because Wu Bin exuded an aura that kept strangers away and acquaintances away.

Particle kinematics, conservation of momentum, conservation of mechanical energy, conservation of angular momentum, rigid body mechanics, etc. Wu Bin once felt that he understood things that he now wanted to study again.

Just because he is not strong enough!