Chapter 5 Chapter Four

When Gu Yuan was about to enter the teaching building, a large object fell directly in front of his line of sight. He instinctively jumped to the side, and a balloon filled with water exploded in front of him. After seeing clearly that it was a water polo, he breathed a sigh of relief, frowned and looked up to look for the "perpetrator". There were many heads poking out from upstairs, but the moment he looked up, they shrank completely. Well, he curled his lips helplessly, fortunately, he didn't hit himself, and didn't splash wet his clothes.He changed his mind, luckily it was just a water polo, and these students were not evil enough to use urine balls or dung balls.He could only pick up the balloons on the ground, throw them into the trash can, and walk into the teaching building.

After graduating from the Department of Physics of Zhejiang University, Gu Yuan returned to his hometown to teach in Ning County No. 1 Middle School, and it took six years in a flash. He is very open-minded and manages students very loosely, but this does not affect the grades of the classes he leads. Some of the graduates who have taught two classes have been admitted to Tsinghua University and Peking University. Now, he is the head teacher of the key class of liberal arts in the second year of high school, and also the physics teacher of two key classes of science.The students knew that he was easy to get along with and never scolded the students, so kind pranks against him happened frequently, but he always laughed it off.

The class bell rang, and he walked into the classroom of the liberal arts class holding the textbook. As soon as he entered the door, he saw the smiles on the faces of many students who were trying to suppress. He curled his lips and showed a wry smile: "Come on, who did it?" The whole class roared with laughter, but no one admitted it. Obviously, this was a "collective crime" with a large number of accomplices. Gu Yuan moved his eyes, clapped his hands to signal for silence, and said, "Theoretically speaking, I wasn't prepared just now, the speed of entering the teaching building was at a constant speed, and the diameter of the balloon was close to 20 centimeters. You threw the balloon from upstairs , should be able to hit me, why did it fail? Of course, I don't believe you guys will show mercy."

A small boy booed from below: "Then we will be sure to hit it next time." Gu Yuan shook his head and looked at the man with a smile: "No wonder you failed physics last time." The boy looked innocent: "What does this have to do with the exam?" Gu Yuan smiled: "This is obviously a physics problem, okay, I'll give you a problem." He turned around and picked up a chalk to draw on the blackboard, "One person moves towards point A at a speed of two meters per second. Moving in a straight line at a constant speed, at this time, there is a water polo ten meters above point A that may fall at any time. Ask, when the person is far away from point A, how far can the water polo fall just to hit him?"

The following students immediately gave the answer. Gu Yuan nodded with satisfaction: "Look, you all answered this simple question correctly. If you first calculate my usual walking speed with a stopwatch, and then calculate the height of the balloon, then you can calculate the landing time of the balloon, and then when I reach When you calculated the results, you threw down the balloon, didn’t I take a shower today? So, physics is very interesting. I know that many of you think that you don’t take physics in the liberal arts college entrance examination, and you usually don’t want to Spend time on this course, but I am worried that many people will have trouble in the next exam. Whether you like physics or not, you have to spend some time before the exam. If everyone gets A in the exam, then come and design a trick My plan, how about it? But the upper limit of game props can only be water polo, if any bastard dares to use shot put, I will never let you go!"

"Haha, good!" The students cheered. A student's prank was analyzed by him into a physics problem. Which student would not like such a teacher. Gu Yuan blinked and said: "Well, since you missed me today, I think you are still relatively weak in mechanics and need to focus on tackling key problems. After this class, I will give you a small test in mechanics. If you fail, I will I've had a 'long talk' with him." The students complained endlessly, and hurriedly said, "Don't worry, today's event was planned by the monitor, and she threw the balloon. If she didn't throw it correctly, it doesn't mean that we haven't learned physics well. Let the monitor test alone."

"Thrown by Zeng Huihui?" Gu Yuan looked at the class monitor in surprise. This girl looks gentle and is usually sensible and obedient. He really didn't expect such a quiet girl to become a "planner" of pranks. Students have the potential to be black-bellied. Zeng Huihui blushed and lowered her head, Gu Yuan smiled helplessly in her heart, probably the academic pressure is too great, even such an honest girl has learned to play pranks.