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Because after falling down a certain height, it attains terminal velocity, after which it moves with constant speed.
this is true when we consider effect of friction zero OR we consider ideal case. In reality, wind and other obstruction in between affects the speed of rain.
It is because of the terminal velocity it attains, after which its velocity stops increasing further.
Because the viscosity of air is non-zero, a retarding force is experienced by the falling raindrop which is proportional to its speed.
When the upwards retarding force = downward force of gravity, the acceleration becomes zero from that time onwards and the raindrop falls with a constant velocity called the terminal velocity.
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