"How high can a drop of water fall to kill someone? This question is actually obvious when it rains, the raindrops are considered to fall from the highest place - the cloud layer, but I have not heard of anyone being killed by rain. Why is this?
In fact, the speed of water droplets in the process of falling is not linearly increasing, but by air resistance, gravity, and resistance to achieve balance, and will soon reach the "final speed" - 10 m / s. After that, no matter how much distance remains to fall, the speed of water droplets will be increased. After that, no matter how much distance is left to fall, the speed will always remain the same at 10 m/s until it hits the ground. Therefore, no matter how high the water drops fall, it is equivalent to the rain on the face of a person, and will not kill.
But we also know that the water has three states if the drop of water is not liquid? In other words, if the raindrops fall in the form of solid hail, will it kill people?
In fact, compared to liquid raindrops, hail is harder and can solidify to a larger volume, so the mass can become higher, instead of being "soft" and always so big like raindrops. An exaggerated hailstone can condense to a size bigger than an apple, and its theoretical falling speed can reach 50 m/s. If such a large and hard hailstone hits the top of a person's head at such a speed, it will knock him/her out even if he/she is not killed.
Therefore, the question of whether water droplets can kill people also has a conclusion - that depends on whether the water droplets are in liquid form or solid form, liquid droplets can not hurt people, solid form depends on the size of its volume.
Since solid drops of water may hurt people, then replaced by the same solid coins? Coins falling from a high altitude, is it possible to hit or kill people? If so, what is the minimum height? In fact, the speed of a coin will not increase indefinitely during its fall, but will also be affected by air resistance, because the greater the speed, the greater the resistance, and eventually the air resistance will be consistent with the speed, the speed will no longer increase.
Physicist Louis Brumfield once did an experiment of throwing coins from a height, he made a flying machine and used it to throw coins to hit himself. The flying machine threw coins from a height of more than 30 meters down, but none of them hit him.
According to Louis Brumfield's analysis, even if he climbed to the top of a skyscraper hundreds of meters high and threw a coin down, the people who were hit on the street would not feel much pain. Don't try it! Throwing objects from a height is a criminal offense!
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