Question

What is the source of kinetic energy of the falling rain drop?

Answer 1

Hint
Apply the law of conservation of energy to find out which energy is converted into kinetic energy. During fall of rain drop, it’s potential energy converted to kinetic energy. As total energy is conserved.

Complete step by step answer
Firstly, the rain drops are water droplets that are condensed from the clouds. The clouds keep on accumulating these drops until they become too heavy to hold it anymore. They then let go of the water drops which causes rain. The potential energy of the cloud due to height along with the latent energy which is entrapped in the form of ice in the cloud are the main source of the kinetic energy of the rain droplets.

Note
Water at such a height must require some additional source to reach here. This is provided by the sun, which evaporates the water so that it can become clouds, this energy of the sun is further produced by the nuclear reaction produced in it. This nuclear fusion of primarily hydrogen and many other elements causes the sun to glow and release a great amount of heat. So, in one way we can say that the source for these rain drops is nuclear fusion.