When a drop of rain falls from the air with enough height, the air resistance is proportional to the square of the velocity. How does the gravitational potential energy and kinetic energy of the drop change?

When a drop of rain falls from the air with enough height, the air resistance is proportional to the square of the velocity. How does the gravitational potential energy and kinetic energy of the drop change?

Analysis: raindrops fall from high altitude, and their height is reduced. According to the fact that the gravitational potential energy is equal to MGH, we can know that their gravitational potential energy is reduced. Because the work will not be generated or disappear out of thin air, it will only convert to each other. In the process of falling, the speed is constantly increasing, and it is also subject to the resistance of the air, so its gravitational potential energy is converted into the work done by kinetic energy and resistance, Because the square of velocity is directly proportional to the air resistance, but the resistance will not increase all the time. It should be that the potential energy of gravity is constant and it is impossible for the resistance to be greater than that of gravity, so it also shows that his velocity will not increase all the time, but has the maximum velocity. When the maximum velocity is reached, the resistance will reach the maximum, that is, gravity and resistance, The raindrop moves downward at a constant speed (because it has an initial velocity of downward movement). According to the kinetic energy equal to 1 / 2mV & sup2;, if the velocity is constant, the kinetic energy is constant, and the gravitational potential energy is decreasing. Because the raindrop still moves downward, its height is still decreasing
A: the gravitational potential energy will decrease, and the kinetic energy will increase first and then remain unchanged