Tragedy, after seeing the news push, my heart tightened, just like the families of the victims of the air crash, I was miserable and sad. This is an event that should be remembered by Chinese people: on Monday, March 2, 2022, a Boeing 737 plane with 132 people crashed in tengxian, Wuzhou, Guangxi. Traffic accidents are fiercer than tigers. The flying and iron ones were not even 100% safe before the deadline. Except for some plane wreckage, there were no reports of survivors. In fact, oral calculation can estimate the speed of the plane when it hits the mountain. (Based on free-falling motion, there is no need to consider the acceleration g of gravity. )

Formula: 1/2vt=8000 (m), t is time in seconds,120s; Considering the altitude of the mountain, even if it is 2000 meters high, when the plane falls from 8000 meters in 2 minutes, the average speed is at least 100 m/s! This speed is three times the speed of expressway 120km/h (33m/s) ... At the moment of touching the ground, the speed becomes zero, and the impact force is impulse = ft. The speed at the moment of impact is at least 200 m/s, which is 6.67 times that of expressway 120 km/h ... which is close to the speed of Japanese gun barrels in War of Resistance against Japanese Aggression. ...

So fast, it stopped as soon as it touched the ground. The shell of this plane is strong enough, but its impact resistance is far less than that of bullets ... bullets hit the wall or the ground. ...

Many people who fly never consider the speed of the plane and some possible physical conditions ... Some people don't have enough knowledge of physics and mathematics, and most people don't think about it at all ... Even after the plane crash, there is not much introspection ... Life is not Iron Man, let alone the soul crossing in the novel. Every smile is a rare gift in life, so we should cherish it.

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