# Rain drops fall from a height of 1Km(approx) . v, speed just before reaching the the ground should be sq. root of 2x9.8*1000 =140 m/s. But it is not so otherwise it would have destructed so many things at this speed. Why the speed of rain is less than 140m/s.

Prajwal kr
49 Points
10 years ago

Because after falling down a certain height, it attains terminal velocity, after which it moves with constant speed.

Malhar Shah
6 Points
10 years ago

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.

Piyush Agarwal
33 Points
10 years ago

It is because of the terminal velocity it attains, after which its velocity stops increasing further.

India VK
42 Points
10 years ago

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.

Rahul John Joseph
31 Points
9 years ago
Very interesting application of terminal velocity due to which the motion of rain drop is unaccelerated after a while