Answer:
One of the undesirable effects of gravity is that it pulls large rocks and asteroids towards the earth. Once they enter our atmosphere, they will cause catastrophic damage. Also due to the effect of gravity, objects falling from tall buildings, airplanes, and spacecraft may fall, thereby killing people. People who fall about 20 feet from the ground may be fatal due to gravity.
Gravity has no end. Gravity appears to be madly greedy and long armed. In fact, you are so popular that even the farthest objects in the observable universe are attracted by gravity. And they link to you in turn. As a result, if there is no outward expansion and acceleration of the universe, everything will fall inward toward a common center of gravity.
On each planet, the only thing that an object can overcome gravity is by moving vertically at a specific velocity called the escape velocity. For the Earth, the escape velocity is 11.2 km / s. People moving at this speed can overcome the gravity of the earth. Also in the swimming pool, it seems to be able to overcome gravity, but it is actually buoyant.
